clang-tidy readability-simplify-boolean-expr

src/lib/terrain_estimation/terrain_estimator.cpp

src/modules/commander/state_machine_helper.cpp

src/modules/ekf2_replay/ekf2_replay_main.cpp

src/modules/fw_att_control/fw_att_control_main.cpp

src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp

src/modules/land_detector/FixedwingLandDetector.cpp

src/modules/land_detector/MulticopterLandDetector.cpp

.../local_position_estimator/BlockLocalPositionEstimator.cpp

src/modules/mavlink/mavlink_mission.cpp

src/modules/navigator/mission_block.cpp

src/modules/systemlib/circuit_breaker.cpp

src/modules/vtol_att_control/vtol_att_control_main.cpp