By Fraser Watson Aston Villa centre back Diego Carlos backed up his brave words about Arsenal in midweek as his side completed a memorable four days at Villa Park. Wednesday’s 1-0 win over champions Manchester City was backed up by victory over the Gunners by the same scoreline on Saturday night, a result that represented their 15th straight Premier League home win. And it leaves Villa in third, just two points off leaders Liverpool with Unai Emery’s side now perceived as genuine title contenders. The Brazilian played a vital part in his side keeping a clean sheet, albeit after Kai Havertz had…