fix(UI): Add playsinline attribute for remote video.

For the video to play on Safari mobile browser, the playsInline attribute needs to be set to true. Set the mute attribute as well which was accidentally removed in code refactor.

modules/UI/videolayout/RemoteVideo.js

 
         streamElement.autoplay = !config.testing?.noAutoPlayVideo;
         streamElement.id = `remoteVideo_${stream.getId()}`;
+        streamElement.mute = true;
+        streamElement.playsInline = true;
 
         // Put new stream element always in front
         streamElement = UIUtils.prependChild(this.container, streamElement);