[Bugfix] Replaced wrong DatabaseConnection (forgotten placeholders)

Change-Id: I16342d2a6a5cd8e5de97b3273338ea4b176edad7
Resolves: #57422
Reviewed-on: https://review.typo3.org/28974
Reviewed-by: Stefan Neufeind
Reviewed-by: Jo Hasenau
Tested-by: Jo Hasenau