[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

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

@@ -1,4 +1,4 @@
-import React from 'react';
+import { PureComponent } from 'react';
 import PropTypes from 'prop-types';
 import { getScrollbarWidth } from 'flavours/glitch/utils/scrollbar';
 import Base from 'flavours/glitch/components/modal_root';
@@ -62,7 +62,7 @@ const MODAL_COMPONENTS = {
   'CLOSED_REGISTRATIONS': ClosedRegistrationsModal,
 };
 
-export default class ModalRoot extends React.PureComponent {
+export default class ModalRoot extends PureComponent {
 
   static propTypes = {
     type: PropTypes.string,