message: Simplify FolderConfig#_updateObject return type
diff: @@ -27,7 +27,7 @@ declare class FolderConfig extends FormApplication<FolderConfig.Data, Folder> {
  * @param event - (unused)
  * @override
  */
  - protected _updateObject(event: Event, formData: Folder.Data): Promise<Folder | Folder | null>;
  + protected _updateObject(event: Event, formData: Folder.Data): Promise<Folder | null>;
  }
  declare namespace FolderConfig {
  