PARIS (Reuters) -Liverpool mayor Steve Rotheram told the French Senate on Thursday how the Champions League soccer final became a “nightmare” as France continued its probe into disorder at the match and it emerged that key CCTV footage had been deleted. The May 28 final, which Liverpool lost 1-0 to Real Madrid, was delayed after police officers forcefully held back people trying to enter the ground. Riot police sprayed tear gas on fans, including women and children. French Interior Minister Gerald Darmanin has said large numbers of Liverpool fans turning up without valid tickets caused a crowd…