LONDON (Reuters) - Oil fell from its 2019 high of almost $67 a barrel on Tuesday as concerns about the progress of U.S.-China trade talks and slowing economic growth countered lower supplies.Supply cuts led by the Organization of the Petroleum Exporting Countries have helped crude to rise more than 20 percent this year, although demand-side worries remain the main drag on the market.Brent crude slipped 64 cents to $65.86 a barrel by 1435 GMT, having reached a 2019 high of $66.83 on Monday. U.S...