Pass props and attrs from CalendarEventDialog to DialogObjectForm

otherwise editing is missing either fields or editItem

aleksis/core/frontend/components/calendar/CalendarEventDialog.vue

@@ -10,7 +10,7 @@ import GroupField from "../generic/forms/GroupField.vue";
 
 <template>
   <dialog-object-form
-    v-bind="$props"
+    v-bind="{ ...$props, ...$attrs }"
     v-on="$listeners"
     :gql-create-mutation="createMutation"
     :gql-patch-mutation="updateMutation"