message: fix the slice permission issue after user click-edit new slice title
diff: @@ -1213,7 +1213,7 @@ class Superset(BaseSupersetView):
  "can_add": slice_add_perm,
  "can_download": slice_download_perm,
  "can_overwrite": is_owner(slc, g.user),
  - 'form_data': form_data,
  + 'form_data': slc.form_data,
  'slice': slc.data,
  }
  