alsa-mixer: add another hardware ID for Traktor Audio 6

alsa-mixer: add another hardware ID for Traktor Audio 6

This is based on a patch by Rolo <rolo@wildfish.com> that replaced the
old ID with the new one. I deemed it better to leave the old ID in use
(I can't verify if the old ID was correct or not).

The original commit message:

    Every time I reinstall or update Ubuntu I have to make this change
    to get it to recognise my Native Instruments Traktor Audio 6
    external soundcard.

    Each time I remember the change by hunting down this forum post in
    German,
    https://forum.ubuntuusers.de/topic/traktor-audio-6-erkannt-aber-nicht-anwaehlbar/3/#post-8759808
    (I don't speak German).

    I'm not sure if the ID is just incorrect or if perhaps the hardware
    identifies itself differently on slightly different models, so
    perhaps we need to duplicate the line - I'm well outside of my
    comfort zone here and I know barely anything about how hardware
    works on Linux but figured if it helps me it would help others so I
    should put it forward.

    Thanks!