[BUGFIX] FollowUp: Restrict visibility of Category in BE

The original patch missed commas at the ends of TCA definition
due to a missing git add before pushing the rebase.

Releases: 6.2
Resolves: #52718
Change-Id: Iee04d3592eae3e0b8ea679dbcd065de4016d01dd
Reviewed-on: https://review.typo3.org/24778
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter