Fix lite status screen SD %

Marlin/src/lcd/dogm/status_screen_lite_ST7920.h

   #if ENABLED(LCD_SET_PROGRESS_MANUALLY) || ENABLED(SDSUPPORT)
 
     #if DISABLED(LCD_SET_PROGRESS_MANUALLY)
-      uint8_t progress_bar_percent; //=0
+      uint8_t progress_bar_percent = 0;
     #endif
 
     #if ENABLED(SDSUPPORT)