Tom Cruise was in typically rakish form as he debuted red hair and flaunted height-boosting shoes while posing with Prince William and Kate Middleton at the London premiere of his new movie “Digger” this week. Breaking through the royals’ natural froideur, the Hollywood star got them to crack a smile on Tuesday as part of his p.r. blitz ahead of the film’s opening this coming Friday. But even though Tinseltown remains in his thrall, Page Six can reveal that Cruise’s Oscar hopes for the movie — about a wealthy oil tycoon forced to fix a global environmental catastrophe he caused — have already plummeted. And the satirical comedy, directed…
