Previously invisible copies showed as beige in the staff client, they stopped doing...

Previously invisible copies showed as beige in the staff client, they stopped doing this in 2.0

This is because in 2.0 the copy counts logic was moved from open-ils.storage.biblio.record_entry.copy_count.staff
to an in-database function wrapped in open-ils.search.biblio.record.copy_count.staff.  Both methods returned various
counts including an 'unshadow' count, however the 'unshadow' in the new database function was not completed and it
has only been returning a simple copy count rather than a count of opac visible copies as it should be to
replicate the old behaviour.

Signed-off-by: James Fournie <jfournie@sitka.bclibraries.ca>