Parameter update - Rename variables in modules/fw_pos_control

using parameter_update.py script

src/modules/local_position_estimator/sensors/sonar.cpp

@@ -67,7 +67,7 @@ int BlockLocalPositionEstimator::sonarMeasure(Vector<float, n_y_sonar> &y)
 	_time_last_sonar = _timeStamp;
 	y.setZero();
 	matrix::Eulerf euler(matrix::Quatf(_sub_att.get().q));
-	y(0) = (d + _sonar_z_offset.get()) *
+	y(0) = (d + _param_lpe_snr_off_z.get()) *
 	       cosf(euler.phi()) *
 	       cosf(euler.theta());
 	return OK;
@@ -90,7 +90,7 @@ void BlockLocalPositionEstimator::sonarCorrect()
 
 	if (cov < 1.0e-3f) {
 		// use sensor value if reasoanble
-		cov = _sonar_z_stddev.get() * _sonar_z_stddev.get();
+		cov = _param_lpe_snr_z.get() * _param_lpe_snr_z.get();
 	}
 
 	// sonar measurement matrix and noise matrix