## Bug description

If I mark an insight as a favorite (⭐) and then refresh, the insight is no longer marked as a favorite although it is (can see it in Favorites).

<img width="390" alt="image" src="https://user-images.githubusercontent.com/30181361/182802236-9ecf0531-899c-4f25-ae86-bc233cefdc2f.png">

Note that I'm in the _Favorites_ tab and that _Bug example_ is not starred.
## Environment

- [x] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: please provide

posthog/api/test/test_insight.py
if team_id is None:
            team_id = self.team.id
        response = self.client.post(f"/api/projects/{team_id}/dashboards/", data)
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
        response_json = response.json()
        return response_json["id"], response_json
    def _add_insight_to_dashboard(
        self, dashboard_ids: List[int], insight_id: int, expected_status: int = status.HTTP_200_OK
    ):
        response = self.client.patch(
            f"/api/projects/{self.team.id}/insights/{insight_id}", {"dashboards": dashboard_ids,},
        )
        self.assertEqual(response.status_code, expected_status)
    def _get_insight(
        self,
        insight_id: int,
        team_id: Optional[int] = None,
        expected_status: int = status.HTTP_200_OK,
        query_params: Optional[Dict[str, Any]] = None,
    ) -> Dict[str, Any]:
        if team_id is None:
            team_id = self.team.id
        if query_params is None:
            query_params = {}
        response = self.client.get(f"/api/projects/{team_id}/insights/{insight_id}", query_params)
        self.assertEqual(response.status_code, expected_status)
        response_json = response.json()
        return response_json
    def _get_insight_activity(