Bug 35205: Fix duplicate id attribute in desks search form

Bug 35205: Fix duplicate id attribute in desks search form

This patch updates the header search form for desks administration so
that it doesn't contain an HTML id attribute which duplicates one on the
desks entry form.

To test, apply the patch and make sure the "UseCirculationDesks" system
preference is enabled.

- Go to Administration -> Circulation desks -> New desk.
- Click the "Desk" label in the entry form. Cursor focus should move to
  the adjacent input field.
- Click the "Search desks" label in the header search form to confirm
  that your cursor moves to the header search form.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>