Fix test scenario

I accidentally changed a dofile call when mass-changing require calls

data/scenario-test.cfg

@@ -1397,7 +1397,7 @@ My best advancement costs $next_cost gold and I’m $experience|% there."
             # The file is not in the repository to allow adding custom stuff to it.
             [command]
                 [lua]
-                    code=<< wesnoth.dofile("code").main() >>
+                    code=<< wesnoth.dofile("lua/code.lua").main() >>
                 [/lua]
             [/command]
         [/set_menu_item]