If sbbs_t::menu() is called with a menu file/code that includes wildcard...

If sbbs_t::menu() is called with a menu file/code that includes wildcard characters (? or *), do the random menu thing.
This is true for Baja MENU function and JS bbs.menu() as well as MENU/CONDMENU @-codes, so no longer need a bbs.random_menu() function (removed).