Bug 11298: Don't force the renew time to 23:59

Bug 11298: Don't force the renew time to 23:59

If you try to renew an item using the "Renewal due date" at the bottom
of the checkouts table, the time will be hardcoded to 23:59 no matter
what the user has chosen.

Test plan:
Check an item out to a patron
renew the item and specify a due date using the datetime picker plugin
at the bottom of the table
Confirm the time you have chosen is correctly used.

Followed test plan. It works as advertised.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>