[TASK] FAL: Add edit button for files in content element fal list

Added a button for editing the metadata of a file out of the
file list in a content element open for editing.

Resolves: #49676
Releases: master
Change-Id: Ia3f2b6f6df0a48ce3907d289aefa9fb7a738b291
Reviewed-on: http://review.typo3.org/36364


Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Philipp Gampe <philipp.gampe@typo3.org>
Tested-by: Philipp Gampe <philipp.gampe@typo3.org>