BRIGHTON, England (Reuters) -Holders Liverpool were knocked out of the FA Cup after losing 2-1 at Brighton & Hove Albion in the fourth round on Sunday as Kaoru Mitoma struck a late winner, before fifth-tier Wrexham were held to a thrilling 3-3 draw by 10-man Sheffield United. In Brighton, Harvey Elliott put Liverpool ahead, Lewis Dunk equalised before halftime and the score stayed at 1-1 until Mitoma found the net in the 92nd minute with a fine finish. It was the second time that Brighton had defeated Liverpool in two weeks, after they beat Juergen Klopp’s side 3-0 in the Premier League. “Unbe…