The 2015 boxing match between Floyd Mayweather and Manny Pacquiao, billed as the Fight of the Century, was widely seen as a disappointment. Now, a year after a hail of class action lawsuits followed the match, Showtime Networks Inc. (SNI) is suing Pacquiao’s promoter Top Rank Inc. (TRI) for an alleged failure to live up to an indemnification agreement. In New York federal court, Showtime filed …