TOUCH_MI_DEPLOY_XPOS fallback to X_MIN_POS (#16226)

Marlin/src/module/probe.cpp

 
   // Move to the magnet to unlock the probe
   void run_deploy_moves_script() {
-    #if TOUCH_MI_DEPLOY_XPOS > X_MAX_BED
+    #ifndef TOUCH_MI_DEPLOY_XPOS
+      #define TOUCH_MI_DEPLOY_XPOS X_MIN_POS
+    #elif TOUCH_MI_DEPLOY_XPOS > X_MAX_BED
       TemporaryGlobalEndstopsState unlock_x(false);
     #endif
     #if TOUCH_MI_DEPLOY_YPOS > Y_MAX_BED