[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

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

@@ -1,4 +1,4 @@
-import React from 'react';
+import { PureComponent } from 'react';
 import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
 import { source_url } from 'flavours/glitch/initial_state';
@@ -6,7 +6,7 @@ import { preferencesLink } from 'flavours/glitch/utils/backend_links';
 import StackTrace from 'stacktrace-js';
 import { Helmet } from 'react-helmet';
 
-export default class ErrorBoundary extends React.PureComponent {
+export default class ErrorBoundary extends PureComponent {
 
   static propTypes = {
     children: PropTypes.node,