audio/alsa-plugins: unbreak PULSEAUDIO=on config after 44c14328c08e

For some reason, /usr/local/share/alsa/alsa.conf.d is no longer searched.

$ sed -i '' '/pulse/s/# //' /usr/local/etc/asound.conf
$ daemon -f pulseaudio
$ aplay foo.wav
ALSA lib pcm.c:2675:(snd_pcm_open_noupdate) Unknown PCM pcm.pulse
aplay: main:839: audio open error: No such file or directory

PR: 245321