Bug 16371: Use multi-select on syspref

Bug 16371: Use multi-select on syspref

This patch replaces textbox with multi-select dropdown on
syspref 'QuoteOfTheDay' and changes tests to match this change.

To test:
1. Check 'OPAC', 'staff client' or both on 'QuoteOfTheDay'.
2. Make sure that quote is displayed on (both) mainpage(s).

Prove t/db_dependent/Koha/Quotes.t

Sponsored-by: Koha-Suomi Oy
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>