[RN] Fix video in audion-only mode

When entering audio-only mode, VideoBridge is instructed to stop sending
remote videos. However, if the instruction fails because DataChannels do
not work, for example, then the app continues to display the remote
videos. Even though they're received in the case of such a failure, no
videos are to be displayed in audio-only mode.

react/features/base/participants/components/ParticipantView.native.js

      * @static
      */
     static propTypes = {
+        /**
+         * The indicator which determines whether conferencing is in audio-only
+         * mode.
+         *
+         * @private
+         */
+        _audioOnly: React.PropTypes.bool,
+
         /**
          * The source (e.g. URI, URL) of the avatar image of the participant
          * with {@link #participantId}.
         // updated only after videoTrack is rendered.
         const waitForVideoStarted = false;
         const renderVideo
-            = (connectionStatus === JitsiParticipantConnectionStatus.ACTIVE)
+            = !this.props._audioOnly
+                && (connectionStatus
+                    === JitsiParticipantConnectionStatus.ACTIVE)
                 && shouldRenderVideoTrack(videoTrack, waitForVideoStarted);
 
         // Is the avatar to be rendered?
  * (instance of) ParticipantView.
  * @private
  * @returns {{
+ *     _audioOnly: boolean,
  *     _avatar: string,
  *     _connectionStatus: string,
  *     _videoTrack: Track
     }
 
     return {
+        _audioOnly: state['features/base/conference'].audioOnly,
         _avatar: avatar,
         _connectionStatus:
             connectionStatus