## 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
response = self.client.post(
            f"/api/projects/{self.team.id}/insights",
            data={
                "name": "a created dashboard",
                "filters": {
                    "events": [{"id": "$pageview"}],
                    "properties": [{"key": "$browser", "value": "Mac OS X"}],
                    "date_from": "-90d",
                },
            },
        )
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
        response_data = response.json()
        self.assertEqual(response_data["description"], None)
        self.assertEqual(response_data["tags"], [])
        objects = Insight.objects.all()
        self.assertEqual(objects.count(), 1)
        self.assertEqual(objects[0].filters["events"][0]["id"], "$pageview")
        self.assertEqual(objects[0].filters["date_from"], "-90d")
        self.assertEqual(len(objects[0].short_id), 8)
        self.assert_insight_activity(
            response_data["id"],
            [
                {
                    "user": {"first_name": "", "email": "user1@posthog.com",},
                    "activity": "created",
                    "created_at": "2012-01-14T03:21:34Z",
                    "scope": "Insight",