By Farah Master and Twinnie Siu HONG KONG (Reuters) -Hong Kong’s government has asked Japan to withdraw a COVID-19 restriction that requires passenger flights from the financial hub to land at only four designated Japanese airports, saying the decision will impact about 60,000 passengers. The United States, India, Italy and Taiwan now require mandatory COVID-19 tests on travellers from China after Beijing’s decision last month to lift stringent zero-COVID policies, fuelling a surge in cases across mainland China. Hong Kong, home to more than 7 million people, is recording around 20,000 coronav…