[BUGFIX] Follow-up "Media module should respect user's file mounts"

EnableFields constraint and deleteClause must be added to the query for
the allowed filemounts of a user.

Resolves: #56745
Releases: 3.0
Change-Id: I33bc02547a09d26eeeb4d7c6e65d42d5f60d759a
Reviewed-on: https://review.typo3.org/30446
Reviewed-by: Lorenz Ulrich
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot