Patch newly-introduced bug in IS_Z2_OR_PROBE

Marlin/Conditionals_post.h

@@ -406,9 +406,9 @@
     #endif
   #endif
 
-  #define IS_Z2_OR_PROBE(P) (PIN_EXISTS(Z2_MIN_PIN)      && (P == Z2_MIN_PIN) \
-                          || PIN_EXISTS(Z2_MAX_PIN)      && (P == Z2_MAX_PIN) \ 
-                          || PIN_EXISTS(Z_MIN_PROBE_PIN) && (P == Z_MIN_PROBE_PIN))
+  #define IS_Z2_OR_PROBE(P) (   (PIN_EXISTS(Z2_MIN)      && (P) == Z2_MIN_PIN)       \
+                             || (PIN_EXISTS(Z2_MAX)      && (P) == Z2_MAX_PIN)       \
+                             || (PIN_EXISTS(Z_MIN_PROBE) && (P) == Z_MIN_PROBE_PIN))
 
   /**
    * Set ENDSTOPPULLUPS for active endstop switches