🐛 Fix wrong Z_ENDSTOP flag bit (#21963)

Bug introduced in #18424

Marlin/src/module/endstops.h

@@ -64,7 +64,7 @@ enum EndstopEnum : char {
 
 #define X_ENDSTOP TERN(X_HOME_TO_MAX, X_MAX, X_MIN)
 #define Y_ENDSTOP TERN(Y_HOME_TO_MAX, Y_MAX, Y_MIN)
-#define Z_ENDSTOP TERN(Z_HOME_TO_MAX, Z_MAX, TERN(HOMING_Z_WITH_PROBE, Z_MIN, Z_MIN_PROBE))
+#define Z_ENDSTOP TERN(Z_HOME_TO_MAX, Z_MAX, TERN(HOMING_Z_WITH_PROBE, Z_MIN_PROBE, Z_MIN))
 
 #undef __ES_ITEM
 #undef _ES_ITEM