function showClassicWidget(type, options) {
  type = type || 'showLightbox';
  push(type, 'classic_widget', options);
}
Show the classic version of the UserVoice widget. This method is usually part
of UserVoice classic's public API.

@api private
@param {String} type ('showTab' or 'showLightbox')
@param {Object} options (optional)