By James Brinsford Saturday Night Takeaway viewers have taken aim at Simon Cowell for ‘setting a bad example’ following a prank by Ant McPartlin and Declan Donnelly for their ITV show. The popular Saturday night spectacular was back for its 20th series and to celebrate this, Ant and Dec trapped Britain’s Got Talent head honcho with the perfect prank while he was a judge on America’s Got Talent. While the hilarious set-up brought laughter from many, there were some who complained that the music and TV mogul was not suitably bedecked in safety gear as he rode his bike. The 64-year-old X Factor b…