Bugfix for simult_.m when used with k_order_pert and pruning at order=1

In the rare combination of k_order_solver, pruning, and order=1 the steady state was not subtracted from the starting values when doing simulations

matlab/simult_.m

@@ -47,7 +47,7 @@ if options_.order == 3
     options_.k_order_solver = 1;
 end
 
-if ~options_.k_order_solver
+if ~options_.k_order_solver || (options_.k_order_solver && options_.pruning) %if k_order_pert is not used or if we do not use Dynare++ with k_order_pert
     if iorder==1
         y_(:,1) = y_(:,1)-dr.ys;
     end