ALSA: usb: Increase volume range that triggers a warning

ALSA: usb: Increase volume range that triggers a warning

On at least the HyperX Cloud III, the range is 18944 (-18944 -> 0 in
steps of 1), so the original check for 255 steps is definitely obsolete.
Let's give ourselves a little more headroom before we emit a warning.

Fixes: 80acefff3bc7 ("ALSA: usb-audio - Add volume range check and warn if it too big")
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: linux-sound@vger.kernel.org
Signed-off-by: Arun Raghavan <arunr@valvesoftware.com>
Link: https://patch.msgid.link/20260116225804.3845935-1-arunr@valvesoftware.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>