Clean up trailing whitespace

Marlin/src/lcd/ultralcd.h

@@ -289,7 +289,7 @@ public:
     static void abort_print();
     static void pause_print();
     static void resume_print();
-    
+
     #if HAS_PRINT_PROGRESS
       #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
         static uint8_t progress_bar_percent;