Across 38 seasons of “The Simpsons,” the Halloween-themed “Treehouse of Horror” episodes have always been a treat of spooky stand-alone storylines. On Sunday, the show surprised viewers with a major resurrection: Apu, the beloved Kwik-E-Mart operator who had not been heard for the better part of a decade, spoke once again in Springfield. He and his wife, Manjula, were back with a meaty plotline — and the voices of actual Indian American actors: Sunil Malhotra, a veteran voice-over a...