Remove React, PureComponent global import, added those imports to files directly

• Remove:
- React, PureComponent global import and added those imports to files directly

app/javascript/gabsocial/containers/media_container.js

@@ -1,4 +1,4 @@
-import React, { PureComponent, Fragment } from 'react';
+import React from 'react';
 import ReactDOM from 'react-dom';
 import PropTypes from 'prop-types';
 import { IntlProvider, addLocaleData } from 'react-intl';
@@ -14,7 +14,7 @@ addLocaleData(localeData);
 
 const MEDIA_COMPONENTS = { MediaGallery, Video, Card, Poll };
 
-export default class MediaContainer extends PureComponent {
+export default class MediaContainer extends React.PureComponent {
 
   static propTypes = {
     locale: PropTypes.string.isRequired,
@@ -49,7 +49,7 @@ export default class MediaContainer extends PureComponent {
 
     return (
       <IntlProvider locale={locale} messages={messages}>
-        <Fragment>
+        <React.Fragment>
           {[].map.call(components, (component, i) => {
             const componentName = component.getAttribute('data-component');
             const Component = MEDIA_COMPONENTS[componentName];
@@ -72,7 +72,7 @@ export default class MediaContainer extends PureComponent {
               component,
             );
           })}
-        </Fragment>
+        </React.Fragment>
       </IntlProvider>
     );
   }