[BUGFIX] Add transparent background for tables again

Resolves: #85155
Related: #85065
Releases: master
Change-Id: I0a3d89678dc23318db3cc3a3845c9c7fb3931959
Reviewed-on: https://review.typo3.org/57126


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>