[BUGFIX] DatabaseConnection::listQuery wrong usage of strpos()

In DatabaseConnection::listQuery strpos() is used with wrong
parameter order.

Resolves: #56135
Releases: 6.2, 6.1, 6.0
Change-Id: Iaa18d46442a2aac21a836216cb61ae376bbb2090
Reviewed-on: https://review.typo3.org/27750
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind