EKF: tighten wind variance growth check

EKF/covariance.cpp

@@ -210,7 +210,7 @@ void Ekf::predictCovariance()
 	float wind_vel_sig;
 
 	// Don't continue to grow wind velocity state variances if they are becoming too large or we are not using wind velocity states as this can make the covariance matrix badly conditioned
-	if (_control_status.flags.wind && (P[22][22] + P[23][23]) < 2.0f * sq(_params.initial_wind_uncertainty)) {
+	if (_control_status.flags.wind && (P[22][22] + P[23][23]) < sq(_params.initial_wind_uncertainty)) {
 		wind_vel_sig = dt * math::constrain(_params.wind_vel_p_noise, 0.0f, 1.0f);
 
 	} else {