By Richard Martin LIVERPOOL, England (Reuters) – Liverpool’s South American strikers Darwin Nunez and Roberto Firmino propelled the team to a 3-1 home win over Southampton in the Premier League on Saturday in their final match before the season pauses for the World Cup. The victory took Liverpool into sixth place in the league standings on 22 points after 14 matches although Brighton & Hove Albion can climb back above them when they play Aston Villa on Sunday. Southampton are 19th on 12 points after 15 games. Firmino, who this week was left out of Brazil’s squad for the World Cup, put Liverpoo…