[BUGFIX] Ensure deleted scheduler tasks are never run

In #79777 a new "tx_scheduler_task.deleted" field was
added, but is not always considered when tasks are run.

Resolves: #86420
Related: #79777
Releases: master
Change-Id: Ide025bda13504bd56dc5f9cc090f5e7e54da6695
Reviewed-on: https://review.typo3.org/58439


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>