[BUGFIX] Set background of td/th in ".table-transparent" to transparent

This solves a display white text on white background for
the selected size in image cropping tool panel

Resolves: #93909
Releases: master
Change-Id: Iaa1d62cbb208afe68556eba19b526e13c127bd29
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68769


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>