app: Mark the transport as started for the relay mode

This code could be shared with the STP setup code.
diff --git a/src/ss7_application.c b/src/ss7_application.c
index cedc2d0..b8e586b 100644
--- a/src/ss7_application.c
+++ b/src/ss7_application.c
@@ -306,6 +306,7 @@
 	app->route_dst.msc = msc;
 
 	app->type = type;
+	app->bsc->m2ua_trans->started = 1;
 	app->route_is_set = 1;
 
 	return 0;