Changed 'Stream Mix' channel names to match the latest Window release

alsa-project/alsa-ucm-conf pull request #572 was opened from FrostyCoolSlug:

This change is to match the Broadcast Mix channel names to the latest release of the GoXLR App on Windows.

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/572 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/572.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf