A Manhattan banker wearing only a condom ambushed a female jogger on the Jersey Shore - but had to scram when she turned out to be a cop, prosecutors said yesterday. The officer threatened to blast 39-year-old John Dee Kelly with pepper spray and later got the plate number off his rented car, enabling cops to track the suspect down. "He picked the wrong person to attack," said Assistant Monmouth County Prosecutor Robert Honecker. "This was a quick-thinking officer." Kelly, who lives in Jersey City, rented a car from Hertz at Newark Airport on May 15 and drove to Union...