fix ts lint warning: Strings must use singlequote

frontend/src/components/left/EventTree.vue

@@ -74,7 +74,7 @@ export default defineComponent({
     const selectedEvent = ref<IKintoneEvent | undefined>(store.selectedEvent);
     const selectedChangeEvent = ref<IKintoneEventGroup | undefined>(undefined);
     const isFieldChange = (node: IKintoneEventNode) => {
-      return node.header == 'EVENT' && node.eventId.indexOf(".change.") > -1;
+      return node.header == 'EVENT' && node.eventId.indexOf('.change.') > -1;
     }
 
     const getSelectedClass = (node: IKintoneEventNode) => {
@@ -117,7 +117,7 @@ export default defineComponent({
 
       $q.notify({
         type: 'positive',
-        caption: "通知",
+        caption: '通知',
         message: `イベント ${node.label} 削除`
       })
     }