LP#1698206: Remove remaining SQL uses of the old copy visibility cache

LP#1698206: Remove remaining SQL uses of the old copy visibility cache

There were two remaining uses of the old copy vis cache in SQL functions used
to render OPAC pages.  This commit gets rid of those.

There is still one reference to the asset.opac_visible_copies table in the old
staged-search function, but that is not used anywhere in the code now, so no
need to change that.  Instead, we should start pruning old code.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>