[BUGFIX] Make custom table styles more explicit

To overwrite the bootstrap styles of the striped
table in the extension manager list, our custom
styles must be defined more explicit.

Resolves: #96865
Related: #93119
Releases: main, 11.5
Change-Id: I9804eef64ad8c71d7f449bf1212c15ee589ca95d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73474


Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>