Replace MBL Z hacking

Marlin/Conditionals_post.h

@@ -709,6 +709,11 @@
   #ifndef Z_CLEARANCE_BETWEEN_PROBES
     #define Z_CLEARANCE_BETWEEN_PROBES Z_HOMING_HEIGHT
   #endif
+  #if Z_CLEARANCE_BETWEEN_PROBES > Z_HOMING_HEIGHT
+    #define MANUAL_PROBE_HEIGHT Z_CLEARANCE_BETWEEN_PROBES
+  #else
+    #define MANUAL_PROBE_HEIGHT Z_HOMING_HEIGHT
+  #endif
 
   #if IS_KINEMATIC
     // Check for this in the code instead