I’m not quite sure what I expected when I sat down in the movie theater to watch “My Dad is a Heel Wrestler,” the new movie starring Hiroshi Tanahashi and a host of other NJPW wrestlers. Considering it had NJPW’s official stamp of approval, I was fairly certain it wouldn’t be pulling the curtain aside to show wrestlers calling their matches and bookers deciding who was going over whom. And it was a children’s movie,…