A last-minute pricing dispute between Vodafone and Apple led to the New Zealand iPhone 4 launch being slightly delayed, according to a new report. Stuff.co.nz claims that Apple told Vodafone to change pricing for the new handset shortly before its was scheduled to hit store shelves, which angered Vodafone and led them to threaten Apple with canceling the launch. The report says that Vodafone’s head office in Britain intervened, telling its New…