message: Stop pretty printing dashboard json
diff: @@ -1642,7 +1642,7 @@ class Superset(BaseSupersetView):
  session.merge(slc)
  session.flush()
  - dashboard.position_json = json.dumps(positions, indent=4, sort_keys=True)
  + dashboard.position_json = json.dumps(positions, sort_keys=True)
  md = dashboard.params_dict
  dashboard.css = data.get('css')
  dashboard.dashboard_title = data['dashboard_title']
  @@ -1659,7 +1659,7 @@ class Superset(BaseSupersetView):
  {key: v for key, v in default_filters_data.items()
  if int(key) in slice_ids}
  md['default_filters'] = json.dumps(applicable_filters)
  - dashboard.json_metadata = json.dumps(md, indent=4)
  + dashboard.json_metadata = json.dumps(md)
  @api
  @has_access_api
  