Bug 13818 - Editing and saving a course reserve displays the add item form

Bug 13818 - Editing and saving a course reserve displays the add item form

If one chooses to edit an existing course reserve for an item, saving it
should go back to the course details, but instead displays the "add
items: scan barcode" form.

Test Plan:
1) Edit a course reserve
2) Save it
3) Note you get the "add items: scan barcode" form
4) Apply this patch
5) Repeat steps 1 and 2
6) Note you are now redirected back to the course details page

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 413a3002992e68f9c6aa27b2d40b6ba9c5685bd9)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>