Hong Kong health authorities expect around 21 new coronavirus cases on Thursday, as the government announced some details of the relaxing of social-distancing measures.The new infections came as a 70-year-old man and an 81-year-old woman died in Tuen Mun Hospital, pushing the city’s Covid-19 fatalities to 81.The first phase of the easing of social-distancing rules – including the reopening of some indoor premises such as beauty parlours and cinemas, and allowing dine-in services until 9pm –…