ao/pulse: create the stream corked

Previously get_state() would keep setting the cork status
while paused, but it only does for that after underflows now.
Correct this oversight by creating the stream corked for start()
to uncork it at a later time.

fixes #8026

audio/out/ao_pulse.c

@@ -444,7 +444,7 @@ static int init(struct ao *ao)
         .fragsize = -1,
     };
 
-    int flags = PA_STREAM_NOT_MONOTONIC;
+    int flags = PA_STREAM_NOT_MONOTONIC | PA_STREAM_START_CORKED;
     if (!priv->cfg_latency_hacks)
         flags |= PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_AUTO_TIMING_UPDATE;