[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

app/javascript/flavours/glitch/features/ui/components/confirmation_modal.jsx

@@ -1,9 +1,9 @@
-import React from 'react';
+import { PureComponent } from 'react';
 import PropTypes from 'prop-types';
 import { injectIntl, FormattedMessage } from 'react-intl';
 import Button from 'flavours/glitch/components/button';
 
-class ConfirmationModal extends React.PureComponent {
+class ConfirmationModal extends PureComponent {
 
   static propTypes = {
     message: PropTypes.node.isRequired,