navigator: use different param names for mission and RTL

src/modules/navigator/navigator_main.cpp

@@ -121,9 +121,9 @@ Navigator::Navigator() :
 	_geofence_violation_warning_sent(false),
 	_fence_valid(false),
 	_inside_fence(true),
-	_mission(this),
+	_mission(this, "MIS"),
 	//_loiter(&_global_pos, &_home_pos, &_vstatus),
-	_rtl(this),
+	_rtl(this, "RTL"),
 	_waypoint_position_reached(false),
 	_waypoint_yaw_reached(false),
 	_time_first_inside_orbit(0),