Warner Bros. Joker has reclaimed its top spot at the box office after a brief win for Disney's Maleficent: Mistress of Evil. The atypical Batman villain origin story did well at the Friday box office, raking in $5.46 million domestically and bringing up its total to $264 million here in the U.S. Joker is proving an unstoppable force, even if those box office numbers show some signs of fatigue in its hot streak as more and more folks going in for first time and (more likely) repeat viewings in the 4,090 theaters it's showing in …