param remove empty @unit

src/drivers/camera_trigger/camera_trigger_params.c

src/drivers/rgbled/rgbled_params.c

src/lib/runway_takeoff/runway_takeoff_params.c

...odules/attitude_estimator_q/attitude_estimator_q_params.c

src/modules/bottle_drop/bottle_drop_params.c

src/modules/commander/commander_params.c

src/modules/ekf2/ekf2_params.c

...ules/ekf_att_pos_estimator/ekf_att_pos_estimator_params.c

src/modules/fw_att_control/fw_att_control_params.c

src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c

src/modules/fw_pos_control_l1/mtecs/mTecs_params.c

src/modules/land_detector/land_detector_params.c

src/modules/local_position_estimator/params.c

src/modules/mavlink/mavlink_params.c

src/modules/mc_att_control/mc_att_control_params.c

...ules/mc_att_control_multiplatform/mc_att_control_params.c

src/modules/mc_pos_control/mc_pos_control_params.c

...ules/mc_pos_control_multiplatform/mc_pos_control_params.c

src/modules/navigator/datalinkloss_params.c

src/modules/navigator/geofence_params.c