(CONTAINS SPOILER ALERTS) Atom Egoyan’s to-catch-a-child-abductor caper “The Captive” was the third competition entry to arrive here. The motif of young ones in distress amid snow-clogged landscapes will no doubt bring to mind the director’s harrowing “The Sweet Hereafter,” which was a big prizewinner here in 1997. Sadly “Captive” does not come close to “Hereafter” in emotional force and restraint. Instead it brings to