navigator: wrong mission topic was copied, clearer naming of offboard mission now

src/modules/uORB/objects_common.cpp

@@ -127,7 +127,7 @@ ORB_DEFINE(position_setpoint_triplet, struct position_setpoint_triplet_s);
 ORB_DEFINE(vehicle_global_velocity_setpoint, struct vehicle_global_velocity_setpoint_s);
 
 #include "topics/mission.h"
-ORB_DEFINE(mission, struct mission_s);
+ORB_DEFINE(offboard_mission, struct mission_s);
 ORB_DEFINE(onboard_mission, struct mission_s);
 
 #include "topics/mission_result.h"

src/modules/uORB/topics/mission.h

@@ -107,7 +107,7 @@ struct mission_s
  */
 
 /* register this as object request broker structure */
-ORB_DECLARE(mission);
+ORB_DECLARE(offboard_mission);
 ORB_DECLARE(onboard_mission);
 
 #endif