API: Fix filtering by source team for feedback

The query parameters when the source was a team filters by adjudicator,
which is null, thus useless. This commit changes the filter to debate-
team__team.

.github/CHANGELOG.rst

@@ -8,6 +8,7 @@ Change Log
 
 - Fixed issue where team names with an institution were longer than the maximum size (`#1564 <https://github.com/TabbycatDebate/tabbycat/issues/1564>`_)
 - Fixed issue that made saving motions impossible through the Round API detail endpoint
+- Fixed issue that made filtering by source team impossible for the Feedback API
 
 2.4.5
 -----

tabbycat/api/views.py

@@ -415,7 +415,7 @@ def get_queryset(self):
         elif query_params.get('source_type') == 'team':
             filters &= Q(source_adjudicator__isnull=True)
             if query_params.get('source'):
-                filters &= Q(source_adjudicator__adjudicator_id=query_params.get('source'))
+                filters &= Q(source_team__team_id=query_params.get('source'))
         if query_params.get('round'):
             filters &= Q(source_adjudicator__debate__round__seq=query_params.get('round')) | Q(source_team__debate__round__seq=query_params.get('round'))
         if query_params.get('target'):