ALSA: hda - Fix wrong TLV mute bit for STAC/IDT codecs

The bit value set for TLV mute was wrong in commit
de8c85f7, which resulted in bogus
dB ranges that screw up PulseAudio.  Corrected with the right constant.

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