Fix Touch-MI sanity checks (#14316)

Marlin/src/inc/SanityCheck.h

    * Touch-MI probe requirements
    */
   #if ENABLED(TOUCH_MI_PROBE)
-    #if ENABLED(Z_SAFE_HOMING)
+    #if DISABLED(Z_SAFE_HOMING)
       #error "TOUCH_MI_PROBE requires Z_SAFE_HOMING."
-    #elif ENABLED(TOUCH_MI_RETRACT_Z)
+    #elif !defined(TOUCH_MI_RETRACT_Z)
       #error "TOUCH_MI_PROBE requires TOUCH_MI_RETRACT_Z."
     #elif defined(Z_AFTER_PROBING)
       #error "TOUCH_MI_PROBE requires Z_AFTER_PROBING to be disabled."