LP1907923: Move course materials button to more suitable location

LP1907923: Move course materials button to more suitable location

To test:

1) Apply this patch
2) In the staff client, go to Admin > Local Admin > Course Reserves List
3) Double click on a course
4) Go to the course materials tab
5) Note that the "Add Material" button is now beneath the temporary call
   number, circ mod, item status, and shelving location fields.

Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>
Signed-off-by: Garry Collum <gcollum@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>