BibSched: authorization typo fix in BibTasklet

* Fixes authorization typo in BibTasklet.  (PR #1746)

Reported-by: Georgios Papoutsakis<georgios.papoutsakis@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>