message: fix: dashboard standalone class not added when parameter set
diff: @@ -1926,6 +1926,8 @@ class Superset(BaseSupersetView): # pylint: disable=too-many-public-methods
  request.args.get(utils.ReservedUrlParameters.EDIT_MODE.value) == "true"
  )
  + standalone_mode = ReservedUrlParameters.is_standalone_mode()
  +
  add_extra_log_payload(
  dashboard_id=dashboard.id,
  dashboard_version="v2",
  @@ -1944,6 +1946,7 @@ class Superset(BaseSupersetView): # pylint: disable=too-many-public-methods
  bootstrap_data=json.dumps(
  bootstrap_data, default=utils.pessimistic_json_iso_dttm_ser
  ),
  + standalone_mode=standalone_mode,
  )
  @has_access
  