Fix LCD throttle issue (#18055)

Fixes #18044

Marlin/src/lcd/ultralcd.cpp

     // Instead of tracking changes just redraw the Status Screen once per second.
     if (on_status_screen() && !lcd_status_update_delay--) {
       lcd_status_update_delay = TERN(HAS_GRAPHICAL_LCD, 12, 9);
-      max_display_update_time--;
+      if (max_display_update_time) max_display_update_time--;  // Be sure never go to a very big number
       refresh(LCDVIEW_REDRAW_NOW);
     }