A little news from Boston: in the lull between football and baseball season, sports radio here is desperate to fill time. For a while, it was Jose Canseco's book. ('Roids radio! All testosterone, all the time!) But that seems to have paled, because they have lately settled on an even more desperate gimmick: trying to pretend that the Celtics are once again playing professional basketball at the Garden. I, for one, am not going to fall for it.