ekf2: remove size in name of state vector and matrix types

Then the state vector size can be changes without having to update the
name

src/modules/ekf2/EKF/zero_innovation_heading_update.cpp

@@ -56,7 +56,7 @@ void Ekf::controlZeroInnovationHeadingUpdate()
 		aid_src_status.observation_variance = obs_var;
 		aid_src_status.innovation = 0.f;
 
-		Vector24f H_YAW;
+		VectorState H_YAW;
 
 		computeYawInnovVarAndH(obs_var, aid_src_status.innovation_variance, H_YAW);