[BUGFIX] Avoid unused property in ext:adminpanel

Resolves: #95029
Releases: master
Change-Id: I444aa1b0161c140c40af2dca455246d8336fa4ac
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70813


Tested-by: core-ci <typo3@b13.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>