## Bug description

When going to instance status > internal metrics and refreshing the dashboard, the loading fails

https://user-images.githubusercontent.com/148820/120655500-693c7480-c48b-11eb-8c75-6afd4c967506.mp4

## Expected behavior

It reloads successfully

## How to reproduce

See above

## Environment

- [x] PostHog Cloud
- [x] self-hosted PostHog, version/commit: latest

## Additional context

Seems the cause is that "refresh" requests data from `/api/insight/trends` vs getting it from `/api/dashboard/id` as on first load.

Relates to #3609  

#### *Thank you* for your bug report – we love squashing them!

posthog/api/test/test_dashboard.py
self.client.logout()
        dashboard = Dashboard.objects.create(team=self.team, share_token="testtoken", name="public dashboard")
        test_no_token = self.client.get(f"/api/dashboard/{dashboard.pk}/")
        self.assertEqual(test_no_token.status_code, status.HTTP_403_FORBIDDEN)
        response = self.client.get(f"/api/dashboard/{dashboard.pk}/?share_token=testtoken")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.json()["name"], "public dashboard")
    def test_shared_dashboard(self):
        self.client.logout()
        Dashboard.objects.create(
            team=self.team, share_token="testtoken", name="public dashboard", is_shared=True,
        )
        response = self.client.get("/shared_dashboard/testtoken")
        self.assertEqual(response.status_code, 200)
    def test_share_dashboard(self):
        dashboard = Dashboard.objects.create(team=self.team, name="dashboard")
        response = self.client.patch("/api/dashboard/%s/" % dashboard.pk, {"name": "dashboard 2", "is_shared": True},)
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        dashboard = Dashboard.objects.get(pk=dashboard.pk)
        self.assertIsNotNone(dashboard.share_token)
    def test_no_team_dashboards_list(self):
        self.team.delete()
        response = self.client.get("/api/dashboard/")
        self.assertDictEqual(
            response.json(), {"attr": None, "code": "not_found", "detail": "Not found.", "type": "invalid_request",},
        )
        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
    def test_return_cached_results(self):