Bug 14920: Remove C4::Dates from circ/reserveratios.pl

Bug 14920: Remove C4::Dates from circ/reserveratios.pl

This patch removes C4::Dates from circ/reserveratios.pl

To test:
- Make sure you have many holds for biblios with not so much items (e.g. 5 holds, 1 item)
  or follow hint below
- Go to Home > Circulation > Hold ratios
- Verify that everything works the same without an dwith patch

Hint: To get a big table you can set 'Hod ratio' in the filter to 0.1  (default value is 3).
This was will trigger biblios with less holds than items.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised. Tested with dateformat syspref, datepiker Ok

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>