Add room name to browser tab title

Fixes #5480

Signed-off-by: Ruben Kerkhof <ruben@rubenkerkhof.com>

react/features/conference/components/web/Conference.js

      * @inheritdoc
      */
     componentDidMount() {
-        document.title = interfaceConfig.APP_NAME;
+        document.title = `${APP.conference.roomName} | ${interfaceConfig.APP_NAME}`;
         this._start();
     }