Bug 29832: Make library column in desk list sortable

Bug 29832: Make library column in desk list sortable

This patch makes minor updates to the DataTable configuration on the
Circulation Desks Administration page. Redundant options are removed and
existing options are updated to use current DataTables syntax.

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

- Go to Administration -> Circulation desks.
- Add multiple circulation desks if necessary, at multiple libraries.
- The "Desk" column should be sorted by default, and the "Actions"
  column should not be sortable.
- The "Library" column should be sortable.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>