By Nick Mulvenney SYDNEY (Reuters) – All-rounder Ben Stokes brushed off an underwhelming run of form with the bat to usher England into the semi-finals of the Twenty20 World Cup with a victory over Sri Lanka on Saturday. A middle order collapse had England wobbling in their pursuit of 142 for victory at the Sydney Cricket Ground but Stokes’s unbeaten 42 from 36 balls helped them safely across the line with two balls to spare. “These situations, it’s what he’s made for, I’m delighted for him,” said captain Jos Buttler. “While he’s at the crease it gives you a sense of calm. “He can play a lot o…