Bug 30550: OPAC recalls page tries to use jQueryUI datepicker

Bug 30550: OPAC recalls page tries to use jQueryUI datepicker

This patch updates the recalls page in the OPAC so that it uses
Flatpickr for the "Recall not needed after" field.

To test apply the patch and enable the UseRecalls preference if
necessary. You made need to update your circulation rules as well,
defining some default values for recalls.

- Log in to the OPAC.
- Locate a bibliographic record which has one item and that item is
  checked out.
- Click "Place recall."
- The "Recall not needed after" field should be styled correctly, and
  clicking it should trigger the calendar popup.
- You should be limited to selections after today's date.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>