[BUGFIX] Information of last run is not stored/retrieved

The information is still stored as tx_scheduler.

Use the correct namespace to save the information.

Fixes: #42852
Releases: 6.0

Change-Id: I145eb6518262f160a613589b7d0a1b592f8f1f0a
Reviewed-on: http://review.typo3.org/16767
Reviewed-by: Wouter Wolters
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel