When it comes to rom-com movie weddings, beware Julia Roberts — she’s already run away as a bride and sown chaos at her best friend’s nuptials, and now, in “Ticket to Paradise,” her character has set her matrimony-disrupting sights on her own daughter’s union. Written and directed by Ol Parker, “Ticket to Paradise” reunites Roberts with the rom-com, and with her “Ocean’s Eleven” co-star George Clooney, too, but what should be a slam dunk is instead a missed free throw.