message: fix WidgetUtils setRoomWidget signature
diff: @@ -278,10 +278,10 @@ export default class WidgetUtils {
  static setRoomWidget(
  roomId: string,
  widgetId: string,
  - widgetType: WidgetType,
  - widgetUrl: string,
  - widgetName: string,
  - widgetData: object,
  + widgetType?: WidgetType,
  + widgetUrl?: string,
  + widgetName?: string,
  + widgetData?: object,
  ) {
  let content;
  