Fixing LP 1203796.

The alternate view in the Item Status screen shows a "Total Circs"
field that was under-counting circulations because UNION filtered
out duplicates.  This commit replaces UNION with UNION ALL, which
allows duplicate rows.

Signed-off-by: Chris Sharp <csharp@georgialibraries.org>
Signed-off-by: Ben Shum <bshum@biblio.org>