Misc. code cleanup

Marlin/src/MarlinCore.cpp

   }
 
   inline void finishSDPrinting() {
-    if (queue.enqueue_one_P(PSTR("M1001"))) {
-      marlin_state = MF_RUNNING;
+    if (queue.enqueue_one_P(PSTR("M1001"))) { // Keep trying until it gets queued
+      marlin_state = MF_RUNNING;              // Signal to stop trying
       TERN_(PASSWORD_AFTER_SD_PRINT_END, password.lock_machine());
       TERN_(DGUS_LCD_UI_MKS, ScreenHandler.SDPrintingFinished());
     }

Marlin/src/gcode/queue.cpp

           char* gpos = strchr(command, 'G');
           if (gpos) {
             switch (strtol(gpos + 1, nullptr, 10)) {
-              case 0: case 1:
-              #if ENABLED(ARC_SUPPORT)
-                case 2: case 3:
-              #endif
-              #if ENABLED(BEZIER_CURVE_SUPPORT)
-                case 5:
-              #endif
+              case 0 ... 1:
+              TERN_(ARC_SUPPORT, case 2 ... 3:)
+              TERN_(BEZIER_CURVE_SUPPORT, case 5:)
                 PORT_REDIRECT(SERIAL_PORTMASK(p));     // Reply to the serial port that sent the command
                 SERIAL_ECHOLNPGM(STR_ERR_STOPPED);
                 LCD_MESSAGEPGM(MSG_STOPPED);

Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp

 
 void DGUSScreenHandler::DGUS_RunoutInit(void) {
   #if PIN_EXISTS(MT_DET_1)
-    pinMode(MT_DET_1_PIN, INPUT_PULLUP);
+    SET_INPUT_PULLUP(MT_DET_1_PIN);
   #endif
   runout_mks.de_count      = 0;
   runout_mks.de_times      = 10;
         GotoScreen(MKSLCD_SCREEN_PAUSE);
 
         sendinfoscreen(PSTR("NOTICE"), nullptr, PSTR("Please change filament!"), nullptr, true, true, true, true);
-        // SetupConfirmAction(nullptr);
+        //SetupConfirmAction(nullptr);
         GotoScreen(DGUSLCD_SCREEN_POPUP);
         break;
 

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

         gcode_preview_over = false;
 
         card.closefile();
-        char *cur_name;
-
-        cur_name = strrchr(list_file.file_name[sel_id], '/');
+        char *cur_name = strrchr(list_file.file_name[sel_id], '/');
 
         SdFile file;
         SdFile *curDir;

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

         char* command = wifi_line_buffer;
         while (*command == ' ') command++; // skip any leading spaces
 
-          // Movement commands alert when stopped
-          if (IsStopped()) {
+        // Movement commands alert when stopped
+        if (IsStopped()) {
           char* gpos = strchr(command, 'G');
           if (gpos) {
             switch (strtol(gpos + 1, nullptr, 10)) {
               case 0 ... 1:
-              #if ENABLED(ARC_SUPPORT)
-                case 2 ... 3:
-              #endif
-              #if ENABLED(BEZIER_CURVE_SUPPORT)
-                case 5:
-              #endif
+              TERN_(ARC_SUPPORT, case 2 ... 3:)
+              TERN_(BEZIER_CURVE_SUPPORT, case 5:)
                 SERIAL_ECHOLNPGM(STR_ERR_STOPPED);
                 LCD_MESSAGEPGM(MSG_STOPPED);
                 break;