## 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
"event": "$pageview",
                        "properties": {"$session_id": "three"},
                        "timestamp": "2012-01-14 00:16:30",
                    },  # 
                    {"event": "$pageview", "properties": {"$session_id": "four"}, "timestamp": "2012-01-15 00:16:00"},
                    {
                        "event": "$pageview",
                        "properties": {"$session_id": "four"},
                        "timestamp": "2012-01-15 00:16:20",
                    },  # 
                ],
                "3": [
                    {"event": "$pageview", "properties": {"$session_id": "five"}, "timestamp": "2012-01-15 00:16:00"},
                    {
                        "event": "$pageview",
                        "properties": {"$session_id": "five"},
                        "timestamp": "2012-01-15 00:16:35",
                    },  # 
                ],
            },
            self.team,
        )
        with freeze_time("2012-01-16T04:01:34.000Z"):
            response = self.client.post(
                f"/api/projects/{self.team.id}/insights/trend/",
                {
                    "events": json.dumps([{"id": "$pageview"}]),
                    "breakdown": "$session_duration",
                    "breakdown_type": "session",
                    "breakdown_histogram_bin_count": 2,