[BUGFIX] Remove undefined variable in QueryGenerator

Resolves: #90499
Relates: #90491
Releases: master
Change-Id: Ib2a3f53b88f4a19da0ca2d115114278ddd628f60
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63383


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Ingo Fabbri <ingo.fabbri@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Susanne Moog <look@susi.dev>