Fix function names

(cherry picked from commit cef35cd3)

tests/AIM/fs2000_b1L1L_steadystate.m

 % computes the steady state of fs2000 analyticaly
 % largely inspired by the program of F. Schorfheide
-function [ys,check] = fs2000k_steadystate(ys,exe)
+function [ys,check] = fs2000_b1L1L_steadystate(ys,exe)
   global M_
   
   alp = M_.params(1); 

tests/steady_state/walsh1_old_ss_steadystate.m

-function [ys,check] = wlash1_old_ss_steadystate(ys0,exo)
+function [ys,check] = walsh1_old_ss_steadystate(ys0,exo)
     global M_
     
     check = 0;