ao/pulse: set similar properties as the pipewire backend

Not setting `media.role` especially negatively affects wireplumber's
restore-stream feature as it will save different stream settings for
ao=pulse and ao=pipewire, so they will be restored differently.

For example:

 1. mpv --ao=pipewire ...
 2. mute the stream in pavucontrol
 3. mpv --ao=pulse ...
 4. note that the stream is not muted

To alleviate that issue, set `media.role` the same way it is set
in the pipewire audio backend. (As well as some others.)

See https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3848

audio/out/ao_pulse.c

@@ -294,6 +294,14 @@ static int pa_init_boilerplate(struct ao *ao)
     struct priv *priv = ao->priv;
     char *host = priv->cfg_host && priv->cfg_host[0] ? priv->cfg_host : NULL;
     bool locked = false;
+    pa_proplist *props = pa_proplist_new();
+
+    if (props) {
+        pa_proplist_sets(props, PA_PROP_MEDIA_ROLE, ao->init_flags & AO_INIT_MEDIA_ROLE_MUSIC ?  "music" : "video");
+        pa_proplist_sets(props, PA_PROP_APPLICATION_NAME, ao->client_name);
+        pa_proplist_sets(props, PA_PROP_APPLICATION_ID, ao->client_name);
+        pa_proplist_sets(props, PA_PROP_APPLICATION_ICON_NAME, ao->client_name);
+    }
 
     if (!(priv->mainloop = pa_threaded_mainloop_new())) {
         MP_ERR(ao, "Failed to allocate main loop\n");
@@ -306,8 +314,8 @@ static int pa_init_boilerplate(struct ao *ao)
     pa_threaded_mainloop_lock(priv->mainloop);
     locked = true;
 
-    if (!(priv->context = pa_context_new(pa_threaded_mainloop_get_api(
-                                         priv->mainloop), ao->client_name)))
+    if (!(priv->context = pa_context_new_with_proplist(pa_threaded_mainloop_get_api(
+                                                       priv->mainloop), ao->client_name, props)))
     {
         MP_ERR(ao, "Failed to allocate context\n");
         goto fail;
@@ -336,6 +344,7 @@ static int pa_init_boilerplate(struct ao *ao)
     }
 
     pa_threaded_mainloop_unlock(priv->mainloop);
+    pa_proplist_free(props);
     return 0;
 
 fail:
@@ -350,6 +359,7 @@ static int pa_init_boilerplate(struct ao *ao)
         pa_threaded_mainloop_unlock(priv->mainloop);
     }
     uninit(ao);
+    pa_proplist_free(props);
     return -1;
 }