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It’s the highly improbable Howard Cosell, nasal twang resurrected on Nixon-era videotape, who finally pulls together very entertaining but disparate parts of “Battle of the Sexes.” Directed by Valerie Faris and Jonathan Dayton (“Little Miss Sunshine”), the film is an extremely good-natured, upbeat recounting of the infamous Bobby Riggs-Billie Jean King “man vs. woman” match of 1973. But it doesn’t generate much urgency, not till…