🚸 Prevent accidental button press

Marlin/src/MarlinCore.cpp

@@ -271,6 +271,7 @@ bool wait_for_heatup = true;
     while (wait_for_user && !(ms && ELAPSED(millis(), ms)))
       idle(TERN_(ADVANCED_PAUSE_FEATURE, no_sleep));
     wait_for_user = false;
+    while (ui.button_pressed()) safe_delay(50);
   }
 
 #endif

Marlin/src/lcd/marlinui.h

@@ -717,8 +717,6 @@ public:
       static bool hw_button_pressed() { return BUTTON_CLICK(); }
     #endif
 
-    static bool button_pressed() { return hw_button_pressed() || TERN0(TOUCH_SCREEN, touch_pressed()); }
-
     #if EITHER(AUTO_BED_LEVELING_UBL, G26_MESH_VALIDATION)
       static void wait_for_release();
     #endif
@@ -750,9 +748,12 @@ public:
   #else
 
     static void update_buttons() {}
+    static bool hw_button_pressed() { return false; }
 
   #endif
 
+  static bool button_pressed() { return hw_button_pressed() || TERN0(TOUCH_SCREEN, touch_pressed()); }
+
   #if ENABLED(TOUCH_SCREEN_CALIBRATION)
     static void touch_calibration_screen();
   #endif