Remove deprecated ev_innov_gate param

EKF/common.h

@@ -300,7 +300,6 @@ struct parameters {
 	float range_stuck_threshold{0.1f};	///< minimum variation in range finder reading required to declare a range finder 'unstuck' when readings recommence after being out of range (m)
 
 	// vision position fusion
-        float ev_innov_gate{5.0f};		///< vision estimator fusion innovation consistency gate size (STD)
         float ev_vel_innov_gate{3.0f};		///< vision velocity fusion innovation consistency gate size (STD)
         float ev_pos_innov_gate{5.0f};		///< vision position fusion innovation consistency gate size (STD)