Nostalgia for the 1980s has been too narrow in scope lately, focusing on genre pieces featuring kid characters in the horror remake “It” and Netflix sci-fi series “Stranger Things.” Other important ’80s touchstones, like John Hughes teen comedies and all those films in which a person wakes up in the wrong body — “Big” and “All of Me” were the best of them — have been overlooked as inspirations. The winning “Jumanji: Welcome to the Jungle” smartly exploits these two strains of neglected ’80s comedy.