audio: fix ao_reset() not clearing paused state leading to stuck AO

This would happen when switching from playback stuck in cache wait
(underrun) to another file.

audio/out/buffer.c

@@ -307,6 +307,7 @@ void ao_reset(struct ao *ao)
     }
     wakeup = p->playing;
     p->playing = false;
+    p->paused = false;
     p->recover_pause = false;
     p->hw_paused = false;
     p->end_time_us = 0;