EKF: Update default value for sideslip fusion noise

Use value obtained from tuning on replay logs

src/modules/ekf2/ekf2_main.cpp

@@ -208,7 +208,7 @@ private:
 	control::BlockParamExtFloat _mag_heading_noise;	// measurement noise used for simple heading fusion
 	control::BlockParamExtFloat _mag_noise;		// measurement noise used for 3-axis magnetoemter fusion (Gauss)
 	control::BlockParamExtFloat _eas_noise;		// measurement noise used for airspeed fusion (std m/s)
-	control::BlockParamExtFloat _beta_noise;		// synthetic sideslip noise (m/s)
+	control::BlockParamExtFloat _beta_noise;	// synthetic sideslip noise (m/s)
 	control::BlockParamExtFloat _mag_declination_deg;// magnetic declination in degrees
 	control::BlockParamExtFloat _heading_innov_gate;// innovation gate for heading innovation test
 	control::BlockParamExtFloat _mag_innov_gate;	// innovation gate for magnetometer innovation test

src/modules/ekf2/ekf2_params.c

@@ -387,15 +387,16 @@ PARAM_DEFINE_FLOAT(EKF2_MAG_NOISE, 5.0e-2f);
 PARAM_DEFINE_FLOAT(EKF2_EAS_NOISE, 1.4f);
 
 /**
- * Noise for syntetic sideslip fusion.
+ * Noise for synthetic sideslip fusion.
  *
  * @group EKF2
- * @min 0.5
- * @max 5.0
+ * @min 0.1
+ * @max 1.0
  * @unit m/s
- * @decimal 1
+ * @decimal 2
  */
-PARAM_DEFINE_FLOAT(EKF2_BETA_NOISE, 5.0f);
+PARAM_DEFINE_FLOAT(EKF2_BETA_NOISE, 0.3f);
+
 /**
  * Magnetic declination
  *