correct the inner loop range for resetting cutoffs when redefining a pair style

this was reported by frank uhlig on lammps-users for lj/cut, but it applies to many more pair styles

src/pair_morse.cpp

@@ -165,7 +165,7 @@ void PairMorse::settings(int narg, char **arg)
   if (allocated) {
     int i,j;
     for (i = 1; i <= atom->ntypes; i++)
-      for (j = i+1; j <= atom->ntypes; j++)
+      for (j = i; j <= atom->ntypes; j++)
         if (setflag[i][j]) cut[i][j] = cut_global;
   }
 }