OTTAWA — As the Maple Leafs get younger, Colton Orr’s fight card will get longer. That’s usually the way it works for NHL enforcers, at least those who find themselves in the spot that Orr does with the rebuilding Leafs. With Toronto now the youngest team in the NHL, without the injured Mike Komisarek and with Garnet Exelby not guaranteed to be in the lineup every night, Orr will be getting overtime minutes on his policeman’s beat. Saturday, for example, there’s a much-anticipated rematch with Ottawa Senators nemesis Matt Carkner.