[team][api] Implement get_serializer_context in TeamDetailView

This allows to remove the custom get method

beat/web/team/api.py

@@ -117,10 +117,10 @@ class TeamDetailView(CommonContextMixin, generics.RetrieveUpdateDestroyAPIView):
             self.serializer_class = self.writing_serializer_class
         return super(TeamDetailView, self).get_serializer(*args, **kwargs)
 
-    def get(self, request, owner_name, team_name):
-        team = self.get_object()
-        serializer = self.serializer_class(team, context={"user": request.user})
-        return Response(serializer.data)
+    def get_serializer_context(self):
+        context = super().get_serializer_context()
+        context["user"] = self.request.user
+        return context
 
     def delete(self, request, owner_name, team_name):
         team = self.get_object()