## 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
filter_dict = {
            "events": [{"id": "$pageview"}],
        }
        insight_1 = Insight.objects.create(
            filters=Filter(data=filter_dict).to_dict(), team=self.team, short_id="12345678",
        )
        insight_2 = Insight.objects.create(
            filters=Filter(data=filter_dict).to_dict(), team=self.team, short_id="98765432",
        )
        self.client.post(f"/api/projects/{self.team.id}/insights/{insight_1.id}/viewed")
        self.client.post(f"/api/projects/{self.team.id}/insights/{insight_2.id}/viewed")
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/?my_last_viewed=true&order=-my_last_viewed_at"
        )
        response_data = response.json()
        # 
        self.assertEqual(response.status_code, status.HTTP_200_OK)