Remove unused imports

app/javascript/mastodon/features/notifications/index.js

@@ -11,7 +11,6 @@ import {
 } from '../../actions/notifications';
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import NotificationContainer from '../../../glitch/components/notification/container';
-import { ScrollContainer } from 'react-router-scroll';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ColumnSettingsContainer from './containers/column_settings_container';
 import { createSelector } from 'reselect';