[BUGFIX] Properly evaluate if condition in SearchController

Resolves: #90165
Releases: master, 9.5
Change-Id: I6cd1f202c0293902b6444ccd23b30f0f92dbf748
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63628


Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>