Restore vanilla components

app/javascript/mastodon/features/ui/containers/loading_bar_container.js

@@ -0,0 +1,8 @@
+import { connect }    from 'react-redux';
+import LoadingBar from 'react-redux-loading-bar';
+
+const mapStateToProps = (state) => ({
+  loading: state.get('loadingBar'),
+});
+
+export default connect(mapStateToProps)(LoadingBar.WrappedComponent);