[BUGFIX] Adjust TCA if EXT:filemetadata is not loaded

As EXT:filemetadata is a not required
extension but suggested, the TCA must be set
accordingly, more particularly for the Grid.

Change-Id: Id1c443b37db8347caf82f082ab54abdfaf0d8994
Releases: 3.0
Resolves: #59076
Reviewed-on: https://review.typo3.org/30365
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot