Parameter update - Rename variables in modules/fw_pos_control

.../local_position_estimator/BlockLocalPositionEstimator.cpp

.../local_position_estimator/BlockLocalPositionEstimator.hpp

src/modules/local_position_estimator/sensors/baro.cpp

src/modules/local_position_estimator/sensors/flow.cpp

src/modules/local_position_estimator/sensors/gps.cpp

src/modules/local_position_estimator/sensors/land.cpp

...dules/local_position_estimator/sensors/landing_target.cpp

src/modules/local_position_estimator/sensors/lidar.cpp

src/modules/local_position_estimator/sensors/mocap.cpp

src/modules/local_position_estimator/sensors/sonar.cpp

src/modules/local_position_estimator/sensors/vision.cpp