Bugfix (#7265)

Fix compile error when UBL is enabled but there is no LCD Panel.

Marlin/stepper.cpp

 
 // public:
 
-#if ENABLED(AUTO_BED_LEVELING_UBL)
+#if ENABLED(AUTO_BED_LEVELING_UBL) && ENABLED(ULTIPANEL)
   extern bool ubl_lcd_map_control;
 #endif
 
 }
 
 void Stepper::quick_stop() {
-  #if ENABLED(AUTO_BED_LEVELING_UBL)
+  #if ENABLED(AUTO_BED_LEVELING_UBL) && ENABLED(ULTIPANEL)
     if (!ubl_lcd_map_control)
       cleaning_buffer_counter = 5000;
   #else