ALSA: scarlett2: Convert meter levels from little-endian

Add missing conversion from little-endian data to CPU-endian in
scarlett2_usb_get_meter_levels().

Fixes: 3473185f

 ("ALSA: scarlett2: Remap Level Meter values")
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/ZYsBIE3DSKdi4YC/@m.b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>