Fixed LCD_FOR_MELZI SanityCheck

Sanity Check for LCD_FOR_MELZI  would fail with "Please select no more than one LCD controller option" any time #define LCD_FOR_MELZI was enabled in Configuration.h, even if there were no other LCD options enabled.

Marlin/SanityCheck.h

       && DISABLED(ELB_FULL_GRAPHIC_CONTROLLER) && DISABLED(PANEL_ONE)
     + 1
   #endif
-  #if ENABLED(REPRAP_DISCOUNT_SMART_CONTROLLER) && DISABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER)
+  #if ENABLED(REPRAP_DISCOUNT_SMART_CONTROLLER) && DISABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER) && DISABLED(LCD_FOR_MELZI)
     + 1
   #endif
   #if ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER) && DISABLED(BQ_LCD_SMART_CONTROLLER)