[BUGFIX] Replace system palettes with labels

The label of palettes can be overridden in showitem.
These labels are now also removed to correctly find
and remove this system palettes.

Resolves: #104836
Related: #104814
Releases: main
Change-Id: I322ffd71fcc062ad07ff9b59f2f8dd32a381668f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85902


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