Prevent adding backdrops to popups in popups

After installing patch purge caches. Login as admin. Add a Label type resource to a course. In Atto click the "Manage files" button. Behind this popup you should see a dark overlay on the parent page. In the popup click the file picker button (page icon). The File picker popup should open within the Manage files popup. The new popup should not add another dark overlay on the Manage files popup, only a light shade on the new popup