## 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/insight.py
for dashboard in Dashboard.objects.filter(id__in=ids_to_add):
                    if (
                        dashboard.get_effective_privilege_level(self.context["request"].user.id)
                        == Dashboard.PrivilegeLevel.CAN_VIEW
                    ):
                        raise PermissionDenied(
                            f"You don't have permission to add insights to dashboard: {dashboard.id}"
                        )
                for dashboard in Dashboard.objects.filter(id__in=ids_to_add):
                    if dashboard.team != instance.team:
                        raise serializers.ValidationError("Dashboard not found")
                    DashboardTile.objects.create(insight=instance, dashboard=dashboard)
                if ids_to_remove:
                    DashboardTile.objects.filter(dashboard_id__in=ids_to_remove, insight=instance).delete()
                
                instance.dashboards.set(dashboards)
        updated_insight = super().update(instance, validated_data)
        changes = changes_between("Insight", previous=before_update, current=updated_insight)
        log_insight_activity(
            activity="updated",
            insight=updated_insight,
            insight_id=updated_insight.id,
            insight_short_id=updated_insight.short_id,
            organization_id=self.context["request"].user.current_organization_id,
            team_id=self.context["team_id"],
            user=self.context["request"].user,
            changes=changes,
        )
        return updated_insight
    def get_result(self, insight: Insight):