Recently, Indonesia, in a kind of post-colonial cultural boomerang, announced its own version of “The Traitors.” About forty international adaptations are either airing or have been greenlit, putting the series on par with reality bigwigs such as “Survivor” and “Big Brother.” The premise of “The Traitors” is a gleeful ripoff of the parlor game known as Mafia, in which unwitting players must suss out the secret designated killers among them, not unlike what happened on the Batavia.