## 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  

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posthog/api/dashboard.py
import secrets
from typing import Any, Dict, Optional
import posthoganalytics
from django.db.models import Model, Prefetch, QuerySet
from django.db.models.query_utils import Q
from django.http import HttpRequest
from django.shortcuts import get_object_or_404
from django.utils.timezone import now
from django.views.decorators.clickjacking import xframe_options_exempt
from rest_framework import authentication, response, serializers, viewsets
from rest_framework.decorators import action
from rest_framework.exceptions import AuthenticationFailed, NotFound
from rest_framework.permissions import IsAuthenticated
from rest_framework.request import Request
from posthog.api.routing import StructuredViewSetMixin
from posthog.api.shared import UserBasicSerializer
from posthog.auth import PersonalAPIKeyAuthentication, PublicTokenAuthentication
from posthog.helpers import create_dashboard_from_template
from posthog.models import Dashboard, DashboardItem, Team
from posthog.permissions import ProjectMembershipNecessaryPermissions
from posthog.utils import get_safe_cache, render_template, str_to_bool
class DashboardSerializer(serializers.ModelSerializer):