fix(calendar(js)): prevent duplicate event creation in case of an event conflict

In case of an calendar event conflict the form submit button was not
disabled after use, allowing it to be clicked again.
This could have resulted in a double creation of the submit event.

UI/WebServerResources/js/Scheduler/ComponentController.js

@@ -547,10 +547,13 @@
               $mdDialog.cancel = vm.originalModalCancel;
               $mdDialog.hide();
             }, function(response) {
-              if (response.status == CalendarSettings.ConflictHTTPErrorCode)
+              vm.allowResubmit(form);
+
+              if (response.status == CalendarSettings.ConflictHTTPErrorCode) {
                 vm.attendeeConflictError = _.isObject(response.data.message) ? response.data.message : { reject: response.data.message };
-              else
+              } else {
                 vm.edit(form);
+              }
             });
         }
       });
@@ -584,6 +587,11 @@
       form.$setDirty();
     };
 
+    this.allowResubmit = function (form) {
+      form.$setPristine();
+      form.$setDirty();
+    };
+
     function getHours() {
       var hours = [];
       for (var i = 0; i <= 23; i++) {