Gene Maddaus Senior Media WriterFran Drescher claimed victory in her race for president of SAG-AFTRA on Thursday night, and vowed to lock arms with her fellow union members and “rise up out of the melee.”Easier said than done.Drescher takes charge of a union that is famously fractious, and more divided than it has been in recent years.Even as the star of “The Nanny” defeated Matthew Modine by a narrow margin, Modine’s dissident faction — Membership First — gained seats on the national board,