By Ian Ransom MELBOURNE (Reuters) – A confident England will look to deny Pakistan a fairytale finish in Sunday’s Twenty20 World Cup final and become the first nation to hold both global white-ball trophies – if Melbourne’s fickle weather permits. Heavy rain could disrupt the Melbourne Cricket Ground showdown and even see the teams crowned joint champions if unable to complete a match of at least 10 overs per side by the end of the reserve day on Monday. However, conditions should hold up long enough to deliver a contest between the two nations who played for the 50-overs World Cup 30 years ag…