BibFormat: passing of user_info for Excel format

* Correctly passes the user_info object to the chain of Excel
  formating functions.

Co-authored-by: Esteban J. G. Gabancho <esteban.jose.garcia.gabancho@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  BibFormat: passing of user_info for Excel format