## 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({})
        insight_id, _ = self._create_insight(
            {"filters": {"events": [{"id": "$pageview"}], "properties": [{"key": "$browser", "value": "Mac OS X"}],},},
        )
        self._add_insight_to_dashboard([dashboard_id], insight_id)
        before_save = DashboardTile.objects.get(dashboard__id=dashboard_id, insight__id=insight_id).filters_hash
        response = self.client.patch(
            f"/api/projects/{self.team.id}/insights/{insight_id}",
            {"filters": {"events": [{"id": "$pageview"}], "properties": [{"key": "$browser", "value": "Chrome"}],},},
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        after_save = DashboardTile.objects.get(dashboard__id=dashboard_id, insight__id=insight_id).filters_hash
        self.assertIsNotNone(before_save)
        self.assertIsNotNone(after_save)
        self.assertNotEqual(before_save, after_save)
    def test_saving_an_insight_with_unchanged_filters_does_not_update_the_dashboard_tile(self):