Bug 19867: Prevent HouseboundRoles.t to fail randomly

Bug 19867: Prevent HouseboundRoles.t to fail randomly

Here is just a guess but we need to tell TestBuilder the values of
housebound_deliverer and housebound_chooser to make sure it will not be
1

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
I manually tested setting to the opposite values in the tests, and
verified those values made the tests fail due to count problems.
The fix is valid.