Maybe my soul is as black as tar, but Disney’s Winnie the Pooh yarn, “Christopher Robin,” is downright un-BEAR-able. I nearly drowned in the free-flowing treacle. It’s the latest -- and least -- live-action version of a Disney animated classic built to fill the House of Mouse with billions. Where “Jungle Book” and “Beauty and the Beast” were high-class, this ball of smarm, based on beloved characters created by British author A.A.