[TASK] Solve nitpick in EXT:scheduler

Remove 2nd argument to call of LanguageService::sL.

Resolves: #81029
Releases: master
Change-Id: Id9aecdfc10f8f2f457a2676c784006eb57f6d3a8
Reviewed-on: https://review.typo3.org/52625


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>