fix lint

src/client/js/components/Admin/UserGroupDetail/UserGroupDetailPage.jsx

@@ -1,5 +1,4 @@
 import React from 'react';
-import PropTypes from 'prop-types';
 
 import UserGroupEditForm from './UserGroupEditForm';
 import UserGroupUserTable from './UserGroupUserTable';
@@ -39,7 +38,4 @@ class UserGroupDetailPage extends React.Component {
 
 }
 
-UserGroupDetailPage.propTypes = {
-};
-
 export default UserGroupDetailPage;