sh: Use try_move instead of try_set

Looks like Vector does not like being copied. I'll have to look into that later...

apps/sh.cpp

@@ -94,7 +94,7 @@ int main()
         if (child == 0)
         {
             Vector<char*> argv;
-            bool ok = split_command_into_argv(command).try_set_value_or_error(argv, errno);
+            bool ok = split_command_into_argv(command).try_move_value_or_error(argv, errno);
             if (!ok)
             {
                 perror("failed to parse command");