Removed prop-types global import, added to files directly

• Removed:
- prop-types global import, added to files directly

app/javascript/gabsocial/components/media_gallery.js

@@ -1,4 +1,5 @@
 import React from 'react'
+import PropTypes from 'prop-types'
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { is } from 'immutable';