core: fix ArduPilot flight mode handling for VTOL

Author: Luc-Meunier

src/mavsdk/core/flight_mode.cpp

@@ -17,6 +17,12 @@ to_flight_mode_from_custom_mode(Autopilot autopilot, MAV_TYPE mav_type, uint32_t
             case MAV_TYPE::MAV_TYPE_GROUND_ROVER:
                 return to_flight_mode_from_ardupilot_rover_mode(custom_mode);
             case MAV_TYPE::MAV_TYPE_FIXED_WING:
+            case MAV_TYPE::MAV_TYPE_VTOL_FIXEDROTOR:
+            case MAV_TYPE::MAV_TYPE_VTOL_TAILSITTER:
+            case MAV_TYPE::MAV_TYPE_VTOL_TAILSITTER_DUOROTOR:
+            case MAV_TYPE::MAV_TYPE_VTOL_TAILSITTER_QUADROTOR:
+            case MAV_TYPE::MAV_TYPE_VTOL_TILTROTOR:
+            case MAV_TYPE::MAV_TYPE_VTOL_TILTWING:
                 return to_flight_mode_from_ardupilot_plane_mode(custom_mode);
             default:
                 return to_flight_mode_from_ardupilot_copter_mode(custom_mode);