alsa: fix alsamixer
alsa: fix alsamixer

Actually, I did some tests, and it does use pulseaudio to play audio,
it's just not the default ctl. As I deleted
`/usr/share/alsa/alsa.conf.d/50-pulseaudio.conf`, I also have to add the
definition.

But it's strange, the pcm is set, but ctl isn't.

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