Fix(mutex) make the mutex update check for finished or running jobs
Fix(mutex) make the mutex update check for finished or running jobs

nyeholt/silverstripe-queuedjobs,silverstripe-australia/silverstripe-queuedjobs,nyeholt/silverstripe-queuedjobs,andrewandante/silverstripe-queuedjobs,silverstripe-australia/silverstripe-queuedjobs,andrewandante/silverstripe-queuedjobs