dyn_ramsey_static.m: only read first entry of error code

May crash otherwise

(cherry picked from commit b1e72d53)

matlab/dyn_ramsey_static.m

@@ -125,7 +125,7 @@ if options_.steadystate_flag
         steady_state=NaN(endo_nbr,1);
         return
     end
-    if check %return 
+    if check(1) %return 
         resids=ones(inst_nbr,1)+sum(abs(x(1:M.orig_endo_nbr))); %return with penalty
         steady_state=NaN(endo_nbr,1);
         return