The third film in the “Insidious” series is like the cheap haunted house version of its predecessors, complete with fog machine, a few extra laughs and jump scares. You’ll walk out having often felt terrified, but you won’t be proud of yourself. While “Insidious” and its sequel were moody, well-shot horror films, the prequel “Insidious: Chapter 3” jettisons more than just the first two movies’ central characters. This third outing is blandly photographed and relies more on momentary shocks than a building feeling of dread. Writer Leigh Whannell takes over the director’s chair from frequent collaborator James Wan, and the movie is the poorer for that substitution.