Change icons in web UI (#27385)

Co-authored-by: Renaud Chaput <renchap@gmail.com>

app/javascript/mastodon/features/ui/components/columns_area.jsx

@@ -23,7 +23,7 @@ import {
 } from '../util/async-components';
 
 import BundleColumnError from './bundle_column_error';
-import ColumnLoading from './column_loading';
+import { ColumnLoading } from './column_loading';
 import ComposePanel from './compose_panel';
 import DrawerLoading from './drawer_loading';
 import NavigationPanel from './navigation_panel';