By Mimosa Spencer and Doyinsola Oladipo PARIS (Reuters) – American tourist Shawna Wilson says she has splashed out on four dresses at the high-end LVMH-owned department store La Samaritaine in Paris, tempted by the prices as the euro reached parity with the U.S. dollar. The euro tumbled below $1 on Wednesday for the first time in two decades on fears that rising energy prices triggered by the Ukraine conflict could tip the European Union into a prolonged economic crisis. “It’s like it’s on sale here,” said Wilson, 49, from Colorado, whose purchases included two dresses for her daughter. “Becau…