fix(rn,filmstrip) simplify visibility calculation

react/features/filmstrip/components/native/Filmstrip.js

      */
     _aspectRatio: Symbol,
 
-    /**
-     * The indicator which determines whether the filmstrip is enabled.
-     */
-    _enabled: boolean,
-
     /**
      * The participants in the conference.
      */
      * @returns {ReactElement}
      */
     render() {
-        const { _aspectRatio, _enabled, _participants, _visible } = this.props;
+        const { _aspectRatio, _participants, _visible } = this.props;
 
-        if (!_enabled) {
+        if (!_visible) {
             return null;
         }
 
 
     return {
         _aspectRatio: state['features/base/responsive-ui'].aspectRatio,
-        _enabled: enabled,
         _participants: participants.filter(p => !p.local),
-        _visible: isFilmstripVisible(state)
+        _visible: enabled && isFilmstripVisible(state)
     };
 }