Leo Barraclough Senior International CorrespondentAmber Heard, giving evidence Wednesday at London’s Royal Courts of Justice on the 12th day of Johnny Depp’s libel trial against the publisher of The Sun newspaper, alleged Depp headbutted her the night before she appeared on James Corden’s “The Late Late Show” in December 2015.Depp is suing News Group Newspapers and journalist Dan Wootton for an article on The Sun website that described him as a “wife beater.” Depp denies that he was violent