[Glitch] Use the new JSX transform everywhere

Port 8f66126b10 to glitch-soc

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

@@ -1,6 +1,6 @@
 import classNames from 'classnames';
 import PropTypes from 'prop-types';
-import React, { PureComponent } from 'react';
+import { PureComponent } from 'react';
 import { LoadingBar } from 'react-redux-loading-bar';
 import ZoomableImage from './zoomable_image';