Remove call to stoch_simul command.

tests/particle/noisy_ar1.mod

@@ -18,8 +18,6 @@ steady;
 
 check;
 
-stoch_simul(irf=0,periods=0,order=2);
-
 estimated_params;
   r,  .975, uniform_pdf,,,0,1;
   stderr y, sqrt(.2), uniform_pdf,,,0,1;