Bug 23547: Add column configuration to course reserves table in the OPAC

Bug 23547: Add column configuration to course reserves table in the OPAC

This patch adds opac-course-reserves to the column config tool
TEST PLAN:
1. Have some course reserves and go look at opac-course-reserves.pl
2. See all the unconfigurable columns
3. Apply patch
4. Browse to column config > OPAC > course_reserves_table
5. Try hiding each column and make sure the correct column is hidden on opac-course-reserves.pl

Signed-off-by: Devinim <kohadevinim@devinim.com.tr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>