Bug 33833: Use database in t/Socialdata.t

Bug 33833: Use database in t/Socialdata.t

Remove T::D::C.
Add subtests.
Remove useless parameter from get_report call.
Add two additional trivial tests.

Note: The module C4::SocialData looks a bit weird.

Test plan:
Run t/SocialData.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>