[schema] fix buggy composite_rdef_roles and associated test
it should only look at rdefs involving the considered entity type.
Closes #3712982
for table, column in [
('transactions', 'tx_time'),
('tx_entity_actions', 'tx_uuid'),
('tx_relation_actions', 'tx_uuid')]:
repo.system_source.create_index(session, table, column)
commit()