[BUGFIX] tools_dbint needs to be called via mod.php

Fixes: #45112
Releases: 6.0, 6.1
Change-Id: I69b22d8d5fcb94e9b3cefcce600fd6b154de6c9d
Reviewed-on: https://review.typo3.org/17980
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn