[BUGFIX] Respect different object mapping for scheduler tasks

Resolves: #60296
Releases: master, 6.2, 6.1
Change-Id: I7bff792b33ffecbe53ac4aee848e6ad16318a538
Reviewed-on: http://review.typo3.org/33494
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>