camera feed does not refresh when publish

[darkbcx]

live camera looks fine when publish for the first time. then i tap "stop publish" the camera freeze. when i tap the "start publish" button again, it remain frozen.

[sean-perkins]

Feel free to submit a PR to resolve the issue.

[joshjensen]

Instead of "this.publisher.unpublish(this.session);" use "this.session.disconnect();"