By Abigail O’Leary Prince Harry and Meghan Markle have been spotted smiling and walking hand in hand ahead of Harry’s fundraising polo match in Florida. Harry wore white trousers, a light blue shirt and a beige jacket – while Meghan sported a cream halterneck dress at the Royal Salute Polo Challenge event in Wellington on Friday. The Sentebale Polo Cup is held every year in aid of Sentebale, the charity Harry co-founded in 2006 that supports young people and children living in southern Africa. The duke will captain the Royal Salute Sentebale Team against the Grand Champions Team, led by his go…