I have a streaming stick plus plugged into my hdmi port. I originally set up the remote to pair with my tv so it could control the power and volume. I now have a sound bar and the roku remote paired to it and can control the volume. I only want to use the sound bar and not the tv volume since when I use the volume on the roku remote, it turns up the volume for both the sound bar and the TV. How can I unpair the remote with the TV so the roku only controls the sound bar?