replace camel case by snake case.

Co-Authored-By: EliaTarasov <elias.tarasov@gmail.com>

src/modules/land_detector/MulticopterLandDetector.cpp

@@ -179,8 +179,8 @@ bool MulticopterLandDetector::_get_ground_contact_state()
 	}
 
 	// Check if we are moving horizontally.
-	_horizontalMovement = sqrtf(_vehicleLocalPosition.vx * _vehicleLocalPosition.vx
-				    + _vehicleLocalPosition.vy * _vehicleLocalPosition.vy) > _params.maxVelocity;
+	_horizontal_movement = sqrtf(_vehicleLocalPosition.vx * _vehicleLocalPosition.vx
+				     + _vehicleLocalPosition.vy * _vehicleLocalPosition.vy) > _params.maxVelocity;
 
 	// if we have a valid velocity setpoint and the vehicle is demanded to go down but no vertical movement present,
 	// we then can assume that the vehicle hit ground
@@ -189,7 +189,7 @@ bool MulticopterLandDetector::_get_ground_contact_state()
 	bool hit_ground = _in_descend && !verticalMovement;
 
 	// TODO: we need an accelerometer based check for vertical movement for flying without GPS
-	if ((_has_low_thrust() || hit_ground) && (!_horizontalMovement || !_has_position_lock())
+	if ((_has_low_thrust() || hit_ground) && (!_horizontal_movement || !_has_position_lock())
 	    && (!verticalMovement || !_has_altitude_lock())) {
 		return true;
 	}
@@ -336,7 +336,7 @@ bool MulticopterLandDetector::_has_minimal_thrust()
 
 bool MulticopterLandDetector::_get_ground_effect_state()
 {
-	if (_in_descend && !_horizontalMovement) {
+	if (_in_descend && !_horizontal_movement) {
 		return true;
 
 	} else {

src/modules/land_detector/MulticopterLandDetector.h

@@ -142,7 +142,7 @@ private:
 	hrt_abstime _landed_time{0};
 
 	bool _in_descend{false};	///< vehicle is desending
-	bool _horizontalMovement{false};	///< vehicle is moving horizontally
+	bool _horizontal_movement{false};	///< vehicle is moving horizontally
 
 	/* get control mode dependent pilot throttle threshold with which we should quit landed state and take off */
 	float _get_takeoff_throttle();