🩹 Fix DGUS_LCD_UI_MKS typo

Fixes #27508

Co-Authored-By: vehystrix <[email protected]>

Author: thinkyhead

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

@@ -78,7 +78,7 @@ class DGUSScreenHandlerMKS : public DGUSScreenHandler {
   static void handleFeedRateMinChange(DGUS_VP_Variable &var, void *val_ptr);
   static void handleMin_T_F(DGUS_VP_Variable &var, void *val_ptr);
 
-  #if HAS_PID_HEATING
+  #if ENABLED(DGUS_FILAMENT_LOADUNLOAD)
     static void filamentLoadUnload(DGUS_VP_Variable &var, void *val_ptr, const int filamentDir);
     static void filamentLoad(DGUS_VP_Variable &var, void *val_ptr);
     static void filamentUnload(DGUS_VP_Variable &var, void *val_ptr);