Fix minor typo.
This commit has a functionality fixes, but they were all related and
not able to be separated into multiply patches.

If EnforcePartLimits=Yes and QOS job is using can override limits, allow
it.

Fix issues if partition allows or denys account's or QOS' and either are
not set.

If a job requests a partition and it doesn't allow a QOS or account the
job is requesting pend unless EnforcePartLimits=Yes.  Before it would
always kill the job at submit.