[BUGFIX] Fix typo in exception of TcaRadioItems

Resolves: #91501
Releases: master, 10.4, 9.5
Change-Id: I7b77a3ee8aceac2cbdb6f3d4e0a02930b66eb863
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64591


Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Haupt <mail@danielhaupt.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Daniel Haupt <mail@danielhaupt.de>
Reviewed-by: Benni Mack <benni@typo3.org>