fix lint errors

src/client/js/components/Sidebar.jsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import PropTypes from 'prop-types';
+// import PropTypes from 'prop-types';
 
 import { withTranslation } from 'react-i18next';
 

src/client/js/components/Sidebar/SidebarNav.jsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import PropTypes from 'prop-types';
+// import PropTypes from 'prop-types';
 
 import { withTranslation } from 'react-i18next';