main: disable probe steering by default

As probe steering only makes sense in specific deployments, it should be
disabled by default.

Update the example config to reflect this change.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: David Bauer <mail@david-bauer.net>

main.c

@@ -104,7 +104,7 @@ void usteer_init_defaults(void)
 
 	config.link_measurement_interval = 30000;
 
-	config.probe_steering = 1;
+	config.probe_steering = 0;
 
 	config.roam_kick_delay = 10000;
 	config.roam_process_timeout = 5 * 1000;