HTE: remove unused method setMeasurementNoiseStdDev()

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

src/modules/mc_hover_thrust_estimator/zero_order_hover_thrust_ekf.hpp

@@ -80,7 +80,6 @@ public:
 
 	void setHoverThrust(float hover_thrust) { _hover_thr = math::constrain(hover_thrust, 0.1f, 0.9f); }
 	void setProcessNoiseStdDev(float process_noise) { _process_var = process_noise * process_noise; }
-	void setMeasurementNoiseStdDev(float measurement_noise) { _acc_var = measurement_noise * measurement_noise; }
 	void setMeasurementNoiseScale(float scale) { _acc_var_scale = scale * scale; }
 	void setHoverThrustStdDev(float hover_thrust_noise) { _state_var = hover_thrust_noise * hover_thrust_noise; }
 	void setAccelInnovGate(float gate_size) { _gate_size = gate_size; }