* Scout24 soars after private equity consortium takeover offer. : LONDON (Reuters) - Signs of progress from U.S.-China trade talks in Beijing helped European stocks reverse earlier losses on Friday, while auto shares continued to slide after figures showing an ongoing slump in European car sales. The trade-sensitive German index, fell as much as 0.7 percent in early deals, but recovered to trade flat on the day after U.S. Treasury Secretary Steven Mnuchin said U.S. and Chinese trade negotiators had “productive meetings”.