Pavol Demitra had three assists after missing 10 games because of broken rib cartilage, and Roberto Luongo made 28 saves in the Vancouver Canucks’ 4-2 victory over the Toronto Maple Leafs on Saturday night. Demitra set up goals by Kyle Wellwood, Ryan Kesler and Daniel Sedin. Willie Mitchell added his first goal of the season to help the Canucks wrap up a six-game homestand with a 4-1-1 record…