[BUGFIX] Remove superflous parameter that blocks the test

assertNotNull takes only one parameter, but due to a left over
from former refactoring, it got two, and the first one
was a static string. So the test actually did not test
what it was supposed to test.

Resolves: #88387
Relates: #87764
Releases: master
Change-Id: Ib39d4eb623f7b079a5a4a6159ffc7520ac70642b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60778


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>