## 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
dashboard_id, _ = self._create_dashboard({"filters": {"date_from": "-14d",}})
        with freeze_time("2012-01-14T03:21:34.000Z"):
            _create_event(team=self.team, event="$pageview", distinct_id="1", properties={"prop": "val"})
            _create_event(team=self.team, event="$pageview", distinct_id="2", properties={"prop": "another_val"})
            _create_event(
                team=self.team,
                event="$pageview",
                distinct_id="2",
                properties={"prop": "val", "another": "never_return_this"},
            )
        with freeze_time("2012-01-15T04:01:34.000Z"):
            response = self.client.post(
                f"/api/projects/{self.team.id}/insights",
                data={
                    "filters": {
                        "events": [{"id": "$pageview"}],
                        "properties": [{"key": "another", "value": "never_return_this", "operator": "is_not"}],