Almost 30 years later, Harry Potter remains the mediocre fantasy series that lived, staying in the cultural consciousness even after a string of uninspired spin-off movies did their best to derail it. Maybe it’s mostly nostalgic kidults eager to relive when they read a book that one time, or perhaps it’s a new generation of children sucked into its multimedia blitz, but Warner Bros. decided there’s enough interest to reheat this bland protagonis…