Apple has added 21 new Aerial screensavers for the fourth-generation Apple TV, with scenery from five new locations, including Greenland, Dubai, Hong Kong, Liwa (UAE), and Los Angeles. Three new scenes from China have also been added. With the exception of Liwa and China, all of the new locations include both day and night scenery. tvOS downloads new screensaver footage on a cyclical basis according to whichever schedule you have set, so users may…