core/job: use new job ID when we failed to deserialize job ID

core/job: use new job ID when we failed to deserialize job ID

This is for the case when we fail to deserialize job ID.
In job_install_deserialized(), we also check the job type, and that is
for the case when we failed to deserialize the job.
Let's gracefully handle the failure in deserializing the job ID.
This is paranoia, and just for safety. Should not change any behavior.