media-session: schedule more rescan for pending changes

Trigger/delay a rescan until the profiles, routes and stream
volume are restored.

See #789

src/examples/media-session/default-profile.c

@@ -245,6 +245,8 @@ static int set_profile(struct device *dev, struct profile *pr)
 
 	dev->active_profile = pr->index;
 
+	sm_media_session_schedule_rescan(dev->impl->session);
+
 	return 0;
 }
 

src/examples/media-session/default-routes.c

@@ -417,6 +417,9 @@ static int restore_route_params(struct device *dev, const char *val, struct rout
 
 	pw_device_set_param((struct pw_node*)dev->obj->obj.proxy,
 			SPA_PARAM_Route, 0, param);
+
+	sm_media_session_schedule_rescan(dev->impl->session);
+
 	return 0;
 }
 

src/examples/media-session/restore-stream.c

@@ -363,6 +363,9 @@ static int restore_stream(struct stream *str, const char *val)
 
 	pw_node_set_param((struct pw_node*)str->obj->obj.proxy,
 			SPA_PARAM_Props, 0, param);
+
+	sm_media_session_schedule_rescan(str->impl->session);
+
 	return 0;
 }