Fix MBL G29 without LCD

Addressing https://github.com/MarlinFirmware/Marlin/pull/8575#discussion_r154536617

Marlin/src/lcd/ultralcd.h

 
 #else // no LCD
 
+  constexpr bool lcd_wait_for_move = false;
+
   inline void lcd_update() {}
   inline void lcd_init() {}
   inline bool lcd_hasstatus() { return false; }