Wintour knows how to throw shade. A former fashion assistant at Vogue could hardly believe her eyes during her job interview with Anna Wintour — because throughout the entire sit-down, the icy editor-in-chief never once removed her specs. “I remember walking into her office and she spun around in her swivel chair wearing sunglasses,” Jenny Syquia told The Post ahead of the May 1 premiere of “The Devil Wears Prada 2.” Former Vogue fashion assistant Jenny Syquia told The Post that Anna Wintour never removed her sunglasses during her job interview. Ron Galella Collection via Getty Images “Nobody had warned me she would be wearing sunglasses, so it really threw me off. It’s very disconcerting to talk to someone when you can’t see their eyes, because eye contact is such an important part of communication.” The Binghamton, NY, native started working at the magazine in 1990 at its Midtown offices at 350 Madison Ave. — and quickly learned the do’s and don’ts when it came to elevator etiquette.…