[BUGFIX] ElementBrowser highlighting for active selected file

Due the ElementBrowser refactoring, highlighting for
currently selected file must be added again.

Releases: master
Resolves: #71230
Change-Id: I6bec9ed5cd317e88f2cdb89e58d560d567bab535
Reviewed-on: https://review.typo3.org/44720


Reviewed-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>