Too bad Diana didn’t invite Etta Candy to join the expedition and perk up that weary boy’s club with her starchy giggles and do-it-all skill set. Diana is the rare superhero who inspires as well as incapacitates, and I wanted to see Etta swell with personal pride and stake her claim as a Wonder Woman, too. She should have been the first to rush after Diana into the fray at No Man’s Land, tossing back one of her namesake boiled…