ALSA: usb-audio: Fix forgotten conversion of control query functions

The recent code refactoring made the argument for some helper
functions to be the explicit UAC_CS_* and UAC2_CS_* value instead of
0-based offset.  However, there was one place left forgotten, and it
caused a regression on some devices appearing as the inconsistent
mixer setup.

This patch corrects the forgotten conversion.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199449


Fixes: 21e9b3e9 ("ALSA: usb-audio: fix uac control query argument")
Tested-by: Nazar Mokrynskyi <nazar@mokrynskyi.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>