Diane Lane plays a Georgetown professor whose new daughter-in-law inspires an authoritarian takeover in a movie that shouldn't be this hard to swallow. Weirdly implausible for a film about a modern American family being torn apart by a fast-moving fascistic movement (a movement that’s led by one of their own members!), Jan Komasa’s “ Anniversary ” has precious little interest in politics. On the contrary, this sober exercise in “you are here” terror is much less interested in left or right than