Remember when ABC was thinking about crumbling “Nightline” if they could get Letterman to move? Obviously, Ted Koppel is back to being cocky about his show. He wasn’t in studio for the first debate Thursday. Tonight, the host is George Stephanopoulos, which lacks a certain something in the appearance of nonpartisanship after a debate — especially when he’s interviewing Mike McCurry…Ted should just retire like Brokaw if he can’t make it to the office on the big nights.