logger: add safety (switch) at minimal rate

src/modules/logger/logger.cpp

@@ -530,6 +530,7 @@ void Logger::add_default_topics()
 	add_topic("position_setpoint_triplet", 200);
 	add_topic("radio_status");
 	add_topic("rate_ctrl_status", 200);
+	add_topic("safety", 1000);
 	add_topic("sensor_combined", 100);
 	add_topic("sensor_preflight", 200);
 	add_topic("system_power", 500);