Bug 27292: Add TablesSettings directive to fix columns_settings_borrowers_table

Bug 27292: Add TablesSettings directive to fix columns_settings_borrowers_table

This patch adds the USE TablesSettings directive which allows the plugin
to be invoked to fill the columns_settings_borrowers_table variable.

Test plan:
0. Do not apply the patch
1. Go to http://localhost:8081/cgi-bin/koha/reserve/request.pl?borrowernumber=51&biblionumber=29
2. View source on the page and note columns_settings_borrowers_table has no value assigned
2. Apply the patch
3. In a new tab, go to http://localhost:8081/cgi-bin/koha/reserve/request.pl?borrowernumber=51&biblionumber=29
4. Note that nothing has changed on the surfeace
5. View source ont he page and note columns_settings_borrowers_table now has a value assigned

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>