Tweak rebuild policy

Since using transitive rebuild could lead to many rebuilds which don't add much value, instead use direct rebuild to ensure packages in the direct dependency chain are rebuild. Let the comment about transitive rebuilds as it still applies and can be used with caution.

See: https://openbuildservice.org/help/manuals/obs-user-guide/cha-obs-build-scheduling-and-dispatching#id-1.2.10.14.5.7

Signed-off-by: Walter Lozano walter.lozano@collabora.com