notify about commit change when we slip out of rec-enabled due to auto-punch

git-svn-id: svn://localhost/ardour2/branches/3.0@10274 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/session.cc

@@ -1051,6 +1051,8 @@ Session::step_back_from_record ()
 		if (Config->get_monitoring_model() == HardwareMonitoring && config.get_auto_input()) {
 			set_track_monitor_input_status (false);
 		}
+
+		RecordStateChanged (); /* emit signal */
 	}
 }