THOSE weren't rosy red cheeks on NBC-10 anchor Tim Lake's face Thursday afternoon. It was embarrassment and anger that producers let a prankster get on the air during the station's coverage of the collapse of the Tropicana garage in A.C. NBC-10 - on the first day of the all-important sweeps rating period - was pranked by the infamous Capt. Janks, acolyte of the loathsome Howard Stern. The 37-year-old Janks got on the air live pretending to be Mark Keating, the CEO of Keating Building Corp. (whose first name is actually Daniel). A producer handling the call took the precaution of...