ALSA: hda/realtek: Whitespace fix

Remove an erroneous whitespace.

Fixes: 31278997

 ("ALSA: hda/realtek - Add headset quirk for Dell DT")
Signed-off-by: Luke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20230704044619.19343-6-luke@ljones.dev
Signed-off-by: Takashi Iwai <tiwai@suse.de>