Fixed wrong use of usb_sndctrlpipe to usb_rcvctrlpipe

Fixes: 44f69ddc ("ALSA: usb-audio: Add sampling rates support for Mbox3")
Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
Link: https://lore.kernel.org/r/20240516134003.39104-1-mbarriolinares@gmail.comSigned-off-by: Takashi Iwai <tiwai@suse.de>