Cover-up in the corridors of 30 Rock! The Tonight Show Starring Jimmy Fallon showrunner, Jamie Granet-Bederman, was “flat-out fired” and did not quit, a high-level source has told OK!. It was announced Friday that Granet-Bederman, who had worked with Fallon for 13 years, was “transitioning to develop a number of new projects” with the late-night host. JIMMY FALLON LISTS NEW YORK CITY PENTHOUSE FOR $15 MILLION — TOUR THE TALK SHOW HOST’S FUNKY FAMILY HOME WITH SECRET PASSAGEWAYS “These last 13 years working with Jimmy have been such a gift. It’s been an honor to have helped him launch not one b…