Bug 17539: Fix Undefined subroutine &C4::Circulation::GetItem error

Bug 17539: Fix Undefined subroutine &C4::Circulation::GetItem error

perl t/db_dependent/Reserves.t

1..72
ok 1 - use C4::Reserves;
ok 2 - CheckReserves Test 1
ok 3 - CheckReserves() include reserve_id in its response
ok 4 - CheckReserves Test 2
ok 5 - CheckReserves Test 3
ok 6 - GetReservesControlBranch returns item home branch when set to ItemHomeLibrary
ok 7 - GetReservesControlBranch returns patron home branch when set to PatronLibrary
ok 8 - Item is correctly waiting
ok 9 - Item is correctly priority 1
ok 10 - Item is correctly priority 2
ok 11 - GetWaiting got only the waiting reserve
ok 12 - GetWaiting got the reserve for the correct borrower
Undefined subroutine &C4::Circulation::GetItem called at /home/ubuntu/kohaclone/C4/Circulation.pm line 1853.

This patch fixes this error. The solution was to use C4::Reserves before C4::Items.
Also due to this edit, change use_ok to require_ok

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>