Bug 14949: Remove C4::Dates from admin/smart-rules.pl and admin/categorie.pl

Bug 14949: Remove C4::Dates from admin/smart-rules.pl and admin/categorie.pl

Bug to remove C4::Dates from
 - admin/smart-rules.pl
 - admin/categorie.pl

To test:

- Apply patch

- Go to Home > Administration > Circulation and fine rules (smart-rules.pl)
- Edit or add a rule
- Verify that 'Hard due date' displays and saves fine

- Go to Home > Administration > Patron categories
- Edit or add a category
- Verify that 'Until date' displays and saves fine

Note: The date picker does not warn about wrong date formats as e.g. while
      editing patrons, but that is not in the scope of this bug

Signed-off-by: Joonas Kylmälä <j.kylmala@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>