Fix bug that caused deleted holdings to be visible in SRU/Z39.50 results

Signed-off-by: Jeff Davis <jdavis@sitka.bclibraries.ca>
Signed-off-by: Ben Shum <bshum@biblio.org>

Conflicts:
	Open-ILS/src/perlmods/lib/OpenILS/Application/SuperCat.pm