ALSA: usb-audio: Add quirk flags for Logitech PRO X Wireless

The Logitech PRO X Wireless is a wireless headset with a hotpluggable
microphone.

Its Playback mixer's GET_CUR somehow becomes broken when the microphone
is detached, so set QUIRK_FLAG_MIXER_GET_CUR_OK to prevent the mixer
behavior from depending on whether the microphone is attached.

Meanwhile, the Playback mixer's minimum value doesn't work properly,
thus set QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE to prevent userspace audio
stack from using the minimum mixer value to tune volume (setting it
when muted is OK).

Reported-by: Alexander Niemeyer <adventureFAN@gmx.de>
Closes: https://msgid.link/6262cbbd-d1f2-4c9d-a1c7-9c5d12636f4b@gmx.de
Closes: https://msgid.link/7984832b-86f6-4934-bfc0-1ed70218973a@gmx.de
Signed-off-by: Rong Zhang <i@rong.moe>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260823-uac-demote-sticky-check-v1-4-a8cbe572edff@rong.moe

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