An NYPD cop is in hot water after the brand-new Cadillac she was driving ended up in the drink near Floyd Bennett Field in Brooklyn, police and sources told The Post on Friday. Officer Halima Hadire, 39, is now on modified duty and had her gun and badge taken from her while the department probes the incident. The officer told cops she was with a 42-year-old man in his glitzy new ride near a boat ramp around 8:45 p.m. Wednesday when the vehicle had a mechanical issue, sources said. The policewoman was off-duty at the time. Hadire said she mistakenly...