audiotest: unmute when setting the volume.

Unset mute when setting the volume levels for the test.

BUG=none
TEST=desktopui_AudioFeedback

Change-Id: I8390d537a81d0d5e57e27f05706d9d21006f1197
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/37503
1 file changed