Bug 37229: Fix table configuration listings for course reserves

Bug 37229: Fix table configuration listings for course reserves

This patch changes the structure of columns_settings.yml so that the
configuration of tables on opac-course-details.pl and
opac-course-reserves.pl are in separate sections. They should not be
grouped under "biblio-detail" (opac-detail.pl).

To test you should have at least one course defined and some items
attached to that course.

- Apply the patch and restart services.
- Go to Administration -> Table settings -> OPAC
- You should see "Jump to" links for biblio-detail, course_items, and
  course_list.
- Make some changes to the course_items and course_list configurations.
- Go to the OPAC and confirm that your changes are reflected in the
  visible columns of those tables.

Sponsored-by: Athens County Public Libraries
Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>