Kal Penn, one of the stars of “Designated Survivor” and formerly a regular on “House,” has posted — complete with captions — excerpts of scripts he’s been given over the years when he auditioned for television roles that were inevitably stereotypes of Indian, Pakistani, or other brown-skinned nationalities. He also recounts the arguments he had with producers who regularly insisted he make the accent “more authentic,” which meant more like “The Simpsons” character Apu.