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/components/pull_to_refresher.js

@@ -1,9 +1,10 @@
+import React from 'react'
 import { BREAKPOINT_EXTRA_SMALL } from '../constants'
 import Responsive from '../features/ui//util/responsive_component'
 import Icon from './icon'
 import Text from './text'
 
-export default class PullToRefresher extends PureComponent {
+export default class PullToRefresher extends React.PureComponent {
 
   render() {
     return (