Bug 29234: (QA follow-up) Fix test that expects wrong defaults

Bug 29234: (QA follow-up) Fix test that expects wrong defaults

This patch changes the get_items_that_can_fill tests so they explicitly
set a 'datearrived' as the new defaults for fresh transfer objects from
TestBuilder is more sane and has this field undef. Tests *should always*
create their required scenarios explicitly.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 6ab19f01b8a6ee800b75781f761949c6c44ce634)
Signed-off-by: Jacob O'Mara <jacobomara901@gmail.com>