Apply HAS_HOTEND_OFFSET where needed

Marlin/src/gcode/calibrate/G34_M422.cpp

 
     // Restore the active tool after homing
     #if HOTENDS > 1
-      tool_change(old_tool_index, 0,
+      tool_change(old_tool_index, 0, (
         #if ENABLED(PARKING_EXTRUDER)
           false // Fetch the previous toolhead
         #else
           true
         #endif
-      );
+      ));
     #endif
 
     #if HAS_LEVELING

Marlin/src/gcode/calibrate/G425.cpp

     SERIAL_EOL();
   }
 
-  #if HOTENDS > 1
+  #if HAS_HOTEND_OFFSET
     //
     // This function requires normalize_hotend_offsets() to be called
     //
       report_measured_backlash(m);
       report_measured_nozzle_dimensions(m);
       report_measured_positional_error(m);
-      #if HOTENDS > 1
+      #if HAS_HOTEND_OFFSET
         normalize_hotend_offsets();
         report_hotend_offsets();
       #endif

Marlin/src/gcode/gcode.cpp

         case 217: M217(); break;                                  // M217: Set filament swap parameters
       #endif
 
-      #if HOTENDS > 1
+      #if HAS_HOTEND_OFFSET
         case 218: M218(); break;                                  // M218: Set a tool offset
       #endif
 

Marlin/src/gcode/gcode.h

     static void M217();
   #endif
 
-  #if HOTENDS > 1
+  #if HAS_HOTEND_OFFSET
     static void M218();
   #endif
 

Marlin/src/inc/Conditionals_post.h

 /**
  * Default hotend offsets, if not defined
  */
-#if HOTENDS > 1
+#if HAS_HOTEND_OFFSET
   #ifndef HOTEND_OFFSET_X
     #define HOTEND_OFFSET_X { 0 } // X offsets for each extruder
   #endif

Marlin/src/lcd/dogm/status_screen_lite_ST7920.cpp

 #if HAS_HEATED_BED
   void ST7920_Lite_Status_Screen::draw_bed_temp(const int16_t temp, const int16_t target, bool forceUpdate) {
     const bool show_target = target && FAR(temp, target);
-    draw_temps(1
-      #if HOTENDS > 1
-        + 1
-      #endif
-      , temp, target, show_target, display_state.bed_show_target != show_target || forceUpdate
-    );
+    draw_temps(HOTENDS > 1 ? 2 : 1, temp, target, show_target, display_state.bed_show_target != show_target || forceUpdate);
     display_state.bed_show_target = show_target;
   }
 #endif

Marlin/src/lcd/extensible_ui/ui_api.cpp

     }
   #endif // HAS_BED_PROBE
 
-  #if HOTENDS > 1
+  #if HAS_HOTEND_OFFSET
 
     float getNozzleOffset_mm(const axis_t axis, const extruder_t extruder) {
       if (extruder - E0 >= HOTENDS) return 0;
       HOTEND_LOOP() hotend_offset[axis][e] -= offs;
     }
 
-  #endif // HOTENDS > 1
+  #endif // HAS_HOTEND_OFFSET
 
   #if ENABLED(BACKLASH_GCODE)
     float getAxisBacklash_mm(const axis_t axis)       { return backlash_distance_mm[axis]; }

Marlin/src/lcd/extensible_ui/ui_api.h

     void smartAdjustAxis_steps(const int16_t steps, const axis_t axis, bool linked_nozzles);
   #endif
 
-  #if HOTENDS > 1
+  #if HAS_HOTEND_OFFSET
     float getNozzleOffset_mm(const axis_t, const extruder_t);
     void setNozzleOffset_mm(const float, const axis_t, const extruder_t);
     void normalizeNozzleOffset(const axis_t axis);

Marlin/src/lcd/menu/menu_advanced.cpp

   #define DEFINE_PIDTEMP_FUNCS(N) _DEFINE_PIDTEMP_BASE_FUNCS(N); //
 #endif
 
-DEFINE_PIDTEMP_FUNCS(0);
-#if ENABLED(PID_PARAMS_PER_HOTEND)
-  #if HOTENDS > 1
-    DEFINE_PIDTEMP_FUNCS(1);
-    #if HOTENDS > 2
-      DEFINE_PIDTEMP_FUNCS(2);
-      #if HOTENDS > 3
-        DEFINE_PIDTEMP_FUNCS(3);
-        #if HOTENDS > 4
-          DEFINE_PIDTEMP_FUNCS(4);
-          #if HOTENDS > 5
-            DEFINE_PIDTEMP_FUNCS(5);
-          #endif // HOTENDS > 5
-        #endif // HOTENDS > 4
-      #endif // HOTENDS > 3
-    #endif // HOTENDS > 2
-  #endif // HOTENDS > 1
-#endif // PID_PARAMS_PER_HOTEND
+#if HOTENDS
+  DEFINE_PIDTEMP_FUNCS(0);
+  #if ENABLED(PID_PARAMS_PER_HOTEND)
+    #if HOTENDS > 1
+      DEFINE_PIDTEMP_FUNCS(1);
+      #if HOTENDS > 2
+        DEFINE_PIDTEMP_FUNCS(2);
+        #if HOTENDS > 3
+          DEFINE_PIDTEMP_FUNCS(3);
+          #if HOTENDS > 4
+            DEFINE_PIDTEMP_FUNCS(4);
+            #if HOTENDS > 5
+              DEFINE_PIDTEMP_FUNCS(5);
+            #endif // HOTENDS > 5
+          #endif // HOTENDS > 4
+        #endif // HOTENDS > 3
+      #endif // HOTENDS > 2
+    #endif // HOTENDS > 1
+  #endif // PID_PARAMS_PER_HOTEND
+#endif // HOTENDS
 
 #define SHOW_MENU_ADVANCED_TEMPERATURE ((ENABLED(AUTOTEMP) && HAS_TEMP_HOTEND) || ENABLED(PID_AUTOTUNE_MENU) || ENABLED(PID_EDIT_MENU))