ao_pulse: change suspend circumvention logic

Commit 957097 attempted to use PA_STREAM_FAIL_ON_SUSPEND to make
ao_pulse exit if the stream was started suspended.

Unfortunately, PA_STREAM_FAIL_ON_SUSPEND is active even during playback.
If you pause mpv, pulseaudio will close the actual audio device after a
while (or something like this), and unpausing won't work. Instead, it
will spam "Entity killed" error messages.

Undo this change and check for suspended audio manually during init.

CC: @mpv-player/stable

audio/out/ao_pulse.c

@@ -418,6 +418,11 @@ static int init(struct ao *ao)
         pa_threaded_mainloop_wait(priv->mainloop);
     }
 
+    if (pa_stream_is_suspended(priv->stream)) {
+        MP_ERR(ao, "The stream is suspended. Bailing out.\n");
+        goto unlock_and_fail;
+    }
+
     pa_threaded_mainloop_unlock(priv->mainloop);
 
     return 0;