## 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
maxDiff = None
    CLASS_DATA_LEVEL_SETUP = False
    def test_get_insight_items(self):
        filter_dict = {
            "events": [{"id": "$pageview"}],
            "properties": [{"key": "$browser", "value": "Mac OS X"}],
        }
        Insight.objects.create(filters=Filter(data=filter_dict).to_dict(), team=self.team, created_by=self.user)
        
        Insight.objects.create(filters=Filter(data=filter_dict).to_dict(), team=self.team)
        response = self.client.get(f"/api/projects/{self.team.id}/insights/", data={"user": "true"}).json()
        self.assertEqual(len(response["results"]), 1)
    def test_created_updated_and_last_modified(self):