Fixed issue where the alert was not being removed when changing the service zip code

src/layouts/service-location/service-zip-modal-question/service-zip-modal-question.vue

@@ -136,8 +136,10 @@ export default {
         },
     },
     watch: {
-        serviceZipCodeInput() {
-            this.resetsOnZipInput();
+        "internalModel.zipCode": {
+            handler() {
+                this.resetsOnZipInput();
+            }   
         },
         modelValue(newValue) {
             this.internalModel = this.copyModel(newValue);