(Below you will find spoilers for the Joker’s new scene in “Zack Snyder’s Justice League”)While nearly all of “Zack Snyder’s Justice League” is made up of footage he shot for the film when Zack Snyder was working on it the first time, there are two exceptions: The stuff involving the Martian Manhunter, and a new apocalyptic Knightmare vision of the future that features none other than Jared Leto’s Joker.In the trailer for “Zack Snyder’s Justice League,” Leto’s Joker made waves for uttering a