Use the new JSX transform (#25064)

app/javascript/mastodon/features/community_timeline/index.jsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import { PureComponent } from 'react';
 import { connect } from 'react-redux';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
@@ -30,7 +30,7 @@ const mapStateToProps = (state, { columnId }) => {
   };
 };
 
-class CommunityTimeline extends React.PureComponent {
+class CommunityTimeline extends PureComponent {
 
   static contextTypes = {
     router: PropTypes.object,