ALSA: usb-audio: Rename Pioneer mixer channel controls

so alsamixer can show the controls in correct categories: capture/playback

Fixes: 171bb512 ("ALSA: usb-audio: Add Pioneer DJ DJM-V10 support")
Signed-off-by: František Kučera <franta-linux@frantovo.cz>
Link: https://patch.msgid.link/20250515122345.3911-2-franta-linux@frantovo.cz


Signed-off-by: Takashi Iwai <tiwai@suse.de>