John Hopewell Chief International Correspondent“Martyrs Lane,” the third feature from Ruth Platt (“The Lesson”), hits Fantasia with a double momentum: Bullish word of mouth, and a recent sale to AMC Networks genre streamer Shudder for North America, U.K., Ireland, Australia and New Zealand.Produced by London’s Ipso Facto Productions, whose credits take in “Irina Palm” and Nicolas Winding Refn’s “Valhalla Rising,” the LevelK sales title is a ghost story but, like the best of that kind, much