[mirotalksfu] - add feature video focus mode

public/js/Rules.js

@@ -56,6 +56,7 @@ let BUTTONS = {
         videoPictureInPicture: true,
         fullScreenButton: true,
         snapShotButton: true,
+        focusVideoButton: true,
         sendMessageButton: true,
         sendFileButton: true,
         sendVideoButton: true,