make disabled property extensible for MeetingPage (#643)
make disabled property extensible for MeetingPage (#643)

* make disabled property extensible for MeetingPage

* add default value to disabled property

ringcentral/ringcentral-js-widget,u9520107/ringcentral-js-widget,ringcentral/ringcentral-js-widget,ringcentral/ringcentral-js-widget,u9520107/ringcentral-js-widget,u9520107/ringcentral-js-widget