Thailand’s teenage guitar sensation Nene Royal won the US$1 million top prize on America’s Got Talent, capping a viral run that made the 16-year-old a national celebrity and drew support from across her home country.Rattikarn Amloy, better known by her stage name Nene Royal, was crowned the winner during Wednesday’s live results show, beating nine other finalists after emerging as the clear favourite before the finale. During Tuesday’s final, she sang and played guitar on a rendition of “Seven...