Fix high LCD status screen update frequency (PR#2655)

Marlin/ultralcd.cpp

@@ -1696,7 +1696,8 @@ void lcd_update() {
         } while( u8g.nextPage() );
       }
     #else
-      (*currentMenu)();
+      if (lcdDrawUpdate)
+        (*currentMenu)();
     #endif
 
     #if ENABLED(LCD_HAS_STATUS_INDICATORS)