TOKYO (Reuters) - Asian shares fell on Wednesday as initial enthusiasm over the latest U.S.-China trade truce was overtaken by fresh concerns over Washington's threat of tariffs on additional European goods.Global growth concerns also weighed on investor confidence, with South Korea the latest trade-reliant economy to cut its economic growth and export targets, a day after weaker factory readings worldwide.MSCI's broadest index of Asia-Pacific shares outside Japan was 0.3% lower, while Japan's..