[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

app/javascript/flavours/glitch/components/column_back_button.jsx

@@ -1,10 +1,10 @@
-import React from 'react';
+import { PureComponent } from 'react';
 import { FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
 import { Icon } from 'flavours/glitch/components/icon';
 import { createPortal } from 'react-dom';
 
-export default class ColumnBackButton extends React.PureComponent {
+export default class ColumnBackButton extends PureComponent {
 
   static contextTypes = {
     router: PropTypes.object,