Fix job/fileID method mismatch in AbstractJobStore.clean()
Fix job/fileID method mismatch in AbstractJobStore.clean()

logJobStoreFileID is a file, but jobStore.delete (intended for jobs)
rather than jobStore.deleteFile (intended for files) was used. This
was exposed by the recent changes to the job format.

BD2KGenomics/slugflow,BD2KGenomics/slugflow