Plane: remove duplicate check for guided mode

Signed-off-by: Rhys Mainwaring <[email protected]>

ArduPlane/GCS_Mavlink.cpp

@@ -1451,10 +1451,7 @@ void GCS_MAVLINK_Plane::handle_set_position_target_global_int(const mavlink_mess
                     }
                 }
 
-                // only accept position updates when in GUIDED mode
-                if (!plane.control_mode->is_guided_mode()) {
-                    return;
-                }
+                // update path guidance
                 plane.mode_guided.handle_guided_path_request(
                     cmd.content.location, unit_vel, path_curvature, dir_is_ccw);