Bug 32883: Correct cubside pickups ordering

Bug 32883: Correct cubside pickups ordering

They are displayed by date of creation, it's not what we want for "to be
staged" for instance, where it needs to be ordered by date/time of
scheduled pickup.

Test plan:
Create several curbside pickups, to have some in the different tabs
Confirm that the order is the one you expect.
=> to be staged ordered by pickup date/time
=> stage and ready ordered by pickup date/time
=> patron is outside ordered by arrival date/time
=> delivered today ordered by *desc* delivered date/time

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>