[BUGFIX] Fix failing unit tests

During cleanup an additional space was introduced in the whereClause
in \TYPO3\CMS\Extbase\Persistence\Generic\Storage\Typo3DbBackend::
addSysLanguageStatement, causing three unit tests to fail.

Fixes: #47636
Related: #47216
Releases: 6.2, 6.1
Change-Id: Ia5177a33074b7543095c780a5274faac172a7d75
Reviewed-on: https://review.typo3.org/20208
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring