fix lint error

packages/app/src/client/util/editor.ts

@@ -4,7 +4,7 @@ type OptionsToSave = {
   isSlackEnabled: boolean;
   slackChannels: string;
   grant: number;
-  pageTags: string[];
+  pageTags: string[] | null;
   grantUserGroupId: string | null;
   grantUserGroupName: string | null;
 };