Bug 8276: circ history - checked out items are later

Bug 8276: circ history - checked out items are later

If the sort is done on "checkin on", the items currently checked out
should be list after all others.

Test plan:
1/ Go on the checkout history page for a record with checked out items
2/ Sort on the "checkin on" column and confirm that the checked out
items are sorted after/before others depending on the sort order
(asc/desc).

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>