As soon as the familiar twinkly score starts up and the eerie blue Warner Brothers logo appears on screen before “Fantastic Beasts and Where to Find Them,” you’re transported back to that oh-so-familiar magical world spun by the keys of J.K. Rowling. It feels like plunging into a bath. But it’s definitely not all-too-familiar - there isn’t a butterbeer or an owl in sight. “Fantastic Beasts” is “Harry Potter” with adults, with the added pizzazz of all the salacious trappings of 1926 Jazz Age New York to spice up the style.