Bug 22652: Editing Course reserves is broken

Bug 22652: Editing Course reserves is broken

To test:
1. Create a course reserve or go on an existing one
2. Add items and add a change for the holdingbranch
3. On the list of items in this course reserve
(course_reserves/course-details.pl?course_id=xx), click on "edit" at the
end of a row :

Without the patch, you can't see the holdingbranch you have choose for
this item, but you see "LEAVE UNCHANGED"

With the patch, you can see the holdingbranch you have choose when
adding this item in the course

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Mikaël Olangcay Brisebois <mikael.olangcay-brisebois@inLibro.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>