Initial update of init-state ROM in init_loop test

ROM clients have to request an initial update of dynamic ROMs explicitly
and should not depend on artificial signals from the ROM session on
signal-handler registration.

Issue #4274

repos/os/src/test/init_loop/main.cc

@@ -254,6 +254,8 @@ struct Test::Main
 	{
 		_init_state.sigh(_init_state_handler);
 
+		_handle_init_state();
+
 		generate_init_config();
 	}
 };