Bug 16371: Rewrite get_daily_quote

Bug 16371: Rewrite get_daily_quote

An updated test plan:
1. Apply the patch(es).
2. Run the database update (updatedatabase on koha-testing-docker).
3. Check that the 'QuoteOfTheDay' system preference options
   work as expected:
   - OPAC: QOTD only appears in the OAPC
   - Staff interface: QOTD only appears in the staff interface
   - Both (Select all): QOTD appears in the staff interface and OPAC
4. Run the tests and make sure they pass:
   prove t/db_dependent/Koha/Quotes.t
5. Sign off!

Sponsored-by: Koha-Suomi Oy
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>