[ ] start streaming the default camera stream, then open viewer app, add local file stream from publisher, but cannot see the new local file stream from viewer.
[ ] start streaming the default camera stream, then open viewer app you can see there are 2 viewers, should be only 1 viewer;
[ ] stop streaming from publisher app, the stream is still showing in viewer app instead of showing waiting screen
Reverts dolbyio-samples/rts-app-react-publisher-viewer#273
Please fix bugs below: