Fix import order with ESLint

Port d27216dc46 to glitch-soc

app/javascript/flavours/glitch/features/compose/components/header.jsx

@@ -1,18 +1,16 @@
-//  Package imports.
 import PropTypes from 'prop-types';
-import ImmutablePropTypes from 'react-immutable-proptypes';
+
 import { injectIntl, defineMessages } from 'react-intl';
+
 import { Link } from 'react-router-dom';
+
+import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
-//  Components.
 import { Icon } from 'flavours/glitch/components/icon';
-
-//  Utils.
-import { conditionalRender } from 'flavours/glitch/utils/react_helpers';
 import { signOutLink } from 'flavours/glitch/utils/backend_links';
+import { conditionalRender } from 'flavours/glitch/utils/react_helpers';
 
-//  Messages.
 const messages = defineMessages({
   community: {
     defaultMessage: 'Local timeline',