Disable box shadows for featured hashtags in light theme (#10034)

Fixes #9990

app/javascript/styles/mastodon-light/diff.scss

@@ -352,6 +352,8 @@
 .moved-account-widget,
 .memoriam-widget,
 .activity-stream,
-.nothing-here {
+.nothing-here,
+.directory__tag > a,
+.directory__tag > div {
   box-shadow: none;
 }