Fix Allen Key Probe pin test (#19520)

Marlin/src/module/probe.cpp

   #if ENABLED(PAUSE_BEFORE_DEPLOY_STOW)
     do {
       #if ENABLED(PAUSE_PROBE_DEPLOY_WHEN_TRIGGERED)
-        if (deploy == (READ(Z_MIN_PROBE_PIN) == Z_MIN_PROBE_ENDSTOP_INVERTING)) break;
+        if (deploy == (
+          #if HAS_CUSTOM_PROBE_PIN
+            READ(Z_MIN_PROBE_PIN) == Z_MIN_PROBE_ENDSTOP_INVERTING
+          #else
+            READ(Z_MIN_PIN) == Z_MIN_ENDSTOP_INVERTING
+          #endif
+        )) break;
       #endif
 
       BUZZ(100, 659);