[BUGFIX] Hide invisible tab-panes to prevent focus hidden form elements

Remove an old hotfix entirely because CKEditor seems to work
without this settings but this caused an accessibility issue for
the backend forms

Resolves: #89605
Releases: master, 9.5
Change-Id: Ie288e6971719aa94da2972f2ea46495e4f0cd728
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62827


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Tested-by: Torben Hansen <derhansen@gmail.com>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Reviewed-by: Torben Hansen <derhansen@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Susanne Moog <look@susi.dev>