chore: remove redundant update-app-config mutation

packages/backend/src/graphql/mutations/update-app-config.ee.js

@@ -1,15 +0,0 @@
-import AppConfig from '../../models/app-config.js';
-
-const updateAppConfig = async (_parent, params, context) => {
-  context.currentUser.can('update', 'App');
-
-  const { id, ...appConfigToUpdate } = params.input;
-
-  const appConfig = await AppConfig.query().findById(id).throwIfNotFound();
-
-  await appConfig.$query().patch(appConfigToUpdate);
-
-  return appConfig;
-};
-
-export default updateAppConfig;