Reverts "retrieve seeded facts directly from source" (test_link.py)

This reverts commit 3ad8849.
The reverted commit broke tests/objects/test_link.py tests.

app/objects/c_operation.py

@@ -187,10 +187,9 @@ def update_untrusted_agents(self, agent):
 
     async def all_facts(self):
         knowledge_svc_handle = BaseService.get_service('knowledge_svc')
-        data_svc_handle = BaseService.get_service('data_svc')
         seeded_facts = []
         if self.source:
-            seeded_facts = await data_svc_handle.get_facts_from_source(self.source.id)
+            seeded_facts = await knowledge_svc_handle.get_facts(criteria=dict(source=self.source.id))
         learned_facts = await knowledge_svc_handle.get_facts(criteria=dict(source=self.id))
         learned_facts = [f for f in learned_facts if f.score > 0]
         return seeded_facts + learned_facts