Remove unused variables (#3906)

app/javascript/mastodon/components/status.js

@@ -7,7 +7,6 @@ import RelativeTimestamp from './relative_timestamp';
 import DisplayName from './display_name';
 import MediaGallery from './media_gallery';
 import VideoPlayer from './video_player';
-import AttachmentList from './attachment_list';
 import StatusContent from './status_content';
 import StatusActionBar from './status_action_bar';
 import { FormattedMessage } from 'react-intl';