## 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
insight = Insight.objects.create(
            team=self.team,
            name="insight with custom filters",
            created_by=self.user,
            filters={"events": [{"id": "$pageview"}]},
        )
        for custom_name, expected_name in zip(
            ["Custom filter", 100, "", "  ", None], ["Custom filter", "100", None, None, None]
        ):
            response = self.client.patch(
                f"/api/projects/{self.team.id}/insights/{insight.id}",
                {"filters": {"events": [{"id": "$pageview", "custom_name": custom_name}]}},
            )
            self.assertEqual(response.status_code, status.HTTP_200_OK)
            response_data = response.json()
            self.assertEqual(response_data["filters"]["events"][0]["custom_name"], expected_name)
            insight.refresh_from_db()
            self.assertEqual(insight.filters["events"][0]["custom_name"], expected_name)
    def test_save_new_funnel(self):