It was the worst of times, and the worst of times — a tale of one City of Angels whose “then” and “now” are equally rotten for Detective Erin Bell. She is played by Nicole Kidman, virtually unrecognizable in both her past- and present-tense roles in “Destroyer,” from first to last unglamorous closeup: pale pallor, splotchy complexion, red-rimmed eyes, skinny-verging-on-emaciated frame.