led: allow to use namespaced mavros (from #439)

rosout_agg cannot be namespaced:
https://github.com/ros/ros_comm/blob/f5fa3a168760d62e9693f10dcb9adfffc6132d22/tools/rosout/rosout.cpp#L127

Co-Authored-By: Playergeek181 <93044104+Playergeek181@users.noreply.github.com>

clover/src/led.cpp

@@ -319,8 +319,8 @@ int main(int argc, char **argv)
 
 	auto set_effect = nh.advertiseService("set_effect", &setEffect);
 
-	auto mavros_state_sub = nh.subscribe("/mavros/state", 1, &handleMavrosState);
-	auto battery_sub = nh.subscribe("/mavros/battery", 1, &handleBattery);
+	auto mavros_state_sub = nh.subscribe("mavros/state", 1, &handleMavrosState);
+	auto battery_sub = nh.subscribe("mavros/battery", 1, &handleBattery);
 	auto rosout_sub = nh.subscribe("/rosout_agg", 1, &handleLog);
 
 	timer = nh.createTimer(ros::Duration(0), &proceed, false, false);