🎨 Update MKS UI for no bed, extruder (#22938)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/lcd/extui/mks_ui/draw_preHeat.cpp

   switch (obj->mks_obj_id) {
     case ID_P_ADD: {
       if (uiCfg.curTempType == 0) {
-        int16_t max_target;
-        thermalManager.temp_hotend[uiCfg.extruderIndex].target += uiCfg.stepHeat;
-        if (uiCfg.extruderIndex == 0)
-          max_target = HEATER_0_MAXTEMP - (WATCH_TEMP_INCREASE + TEMP_HYSTERESIS + 1);
-        else {
-          #if HAS_MULTI_HOTEND
-            max_target = HEATER_1_MAXTEMP - (WATCH_TEMP_INCREASE + TEMP_HYSTERESIS + 1);
-          #endif
-        }
-        if (thermalManager.degTargetHotend(uiCfg.extruderIndex) > max_target)
-          thermalManager.setTargetHotend(max_target, uiCfg.extruderIndex);
-        thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #if HAS_HOTEND
+          int16_t max_target;
+          thermalManager.temp_hotend[uiCfg.extruderIndex].target += uiCfg.stepHeat;
+          if (uiCfg.extruderIndex == 0)
+            max_target = HEATER_0_MAXTEMP - (WATCH_TEMP_INCREASE + TEMP_HYSTERESIS + 1);
+          else {
+            #if HAS_MULTI_HOTEND
+              max_target = HEATER_1_MAXTEMP - (WATCH_TEMP_INCREASE + TEMP_HYSTERESIS + 1);
+            #endif
+          }
+          if (thermalManager.degTargetHotend(uiCfg.extruderIndex) > max_target)
+            thermalManager.setTargetHotend(max_target, uiCfg.extruderIndex);
+          thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #endif
       }
       else {
         #if HAS_HEATED_BED
 
     case ID_P_DEC:
       if (uiCfg.curTempType == 0) {
-        if (thermalManager.degTargetHotend(uiCfg.extruderIndex) > uiCfg.stepHeat)
-          thermalManager.temp_hotend[uiCfg.extruderIndex].target -= uiCfg.stepHeat;
-        else
-          thermalManager.setTargetHotend(0, uiCfg.extruderIndex);
-        thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #if HAS_HOTEND
+          if (thermalManager.degTargetHotend(uiCfg.extruderIndex) > uiCfg.stepHeat)
+            thermalManager.temp_hotend[uiCfg.extruderIndex].target -= uiCfg.stepHeat;
+          else
+            thermalManager.setTargetHotend(0, uiCfg.extruderIndex);
+          thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #endif
       }
       else {
         #if HAS_HEATED_BED
             thermalManager.temp_bed.target -= uiCfg.stepHeat;
           else
             thermalManager.setTargetBed(0);
-
           thermalManager.start_watching_bed();
         #endif
       }
       break;
     case ID_P_OFF:
       if (uiCfg.curTempType == 0) {
-        thermalManager.setTargetHotend(0, uiCfg.extruderIndex);
-        thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #if HAS_HOTEND
+          thermalManager.setTargetHotend(0, uiCfg.extruderIndex);
+          thermalManager.start_watching_hotend(uiCfg.extruderIndex);
+        #endif
       }
       else {
         #if HAS_HEATED_BED
       draw_return_ui();
       break;
     case ID_P_ABS:
-      if (uiCfg.curTempType == 0)
-        thermalManager.setTargetHotend(PREHEAT_2_TEMP_HOTEND, 0);
-      else if (uiCfg.curTempType == 1)
-        thermalManager.setTargetBed(PREHEAT_2_TEMP_BED);
+      if (uiCfg.curTempType == 0) {
+        TERN_(HAS_HOTEND, thermalManager.setTargetHotend(PREHEAT_2_TEMP_HOTEND, 0));
+      }
+      else if (uiCfg.curTempType == 1) {
+        TERN_(HAS_HEATED_BED, thermalManager.setTargetBed(PREHEAT_2_TEMP_BED));
+      }
       break;
     case ID_P_PLA:
-      if (uiCfg.curTempType == 0)
-        thermalManager.setTargetHotend(PREHEAT_1_TEMP_HOTEND, 0);
-      else if (uiCfg.curTempType == 1)
-        thermalManager.setTargetBed(PREHEAT_1_TEMP_BED);
+      if (uiCfg.curTempType == 0) {
+        TERN_(HAS_HOTEND, thermalManager.setTargetHotend(PREHEAT_1_TEMP_HOTEND, 0));
+      }
+      else if (uiCfg.curTempType == 1) {
+        TERN_(HAS_HEATED_BED, thermalManager.setTargetBed(PREHEAT_1_TEMP_BED));
+      }
       break;
   }
 }
 
 void disp_temp_type() {
   if (uiCfg.curTempType == 0) {
-    if (uiCfg.extruderIndex == 1) {
+    if (TERN0(HAS_MULTI_EXTRUDER, uiCfg.extruderIndex == 1)) {
       lv_imgbtn_set_src_both(buttonType, "F:/bmp_extru2.bin");
       if (gCfgItems.multiple_language) {
         lv_label_set_text(labelType, preheat_menu.ext2);
         lv_obj_align(labelType, buttonType, LV_ALIGN_IN_BOTTOM_MID, 0, BUTTON_TEXT_Y_OFFSET);
       }
     }
-    else {
+    else if (ENABLED(HAS_HOTEND)) {
       lv_imgbtn_set_src_both(buttonType, "F:/bmp_extru1.bin");
       if (gCfgItems.multiple_language) {
         lv_label_set_text(labelType, preheat_menu.ext1);
       }
     }
   }
-  else {
+  else if (ENABLED(HAS_HEATED_BED)) {
     lv_imgbtn_set_src_both(buttonType, "F:/bmp_bed.bin");
     if (gCfgItems.multiple_language) {
       lv_label_set_text(labelType, preheat_menu.hotbed);
   public_buf_l[0] = '\0';
 
   if (uiCfg.curTempType == 0) {
-    strcat(public_buf_l, uiCfg.extruderIndex < 1 ? preheat_menu.ext1 : preheat_menu.ext2);
-    sprintf(buf, preheat_menu.value_state, thermalManager.wholeDegHotend(uiCfg.extruderIndex), thermalManager.degTargetHotend(uiCfg.extruderIndex));
+    #if HAS_HOTEND
+      strcat(public_buf_l, uiCfg.extruderIndex < 1 ? preheat_menu.ext1 : preheat_menu.ext2);
+      sprintf(buf, preheat_menu.value_state, thermalManager.wholeDegHotend(uiCfg.extruderIndex), thermalManager.degTargetHotend(uiCfg.extruderIndex));
+    #endif
   }
   else {
     #if HAS_HEATED_BED