Indonesia prepares to sign an $8-billion contract with U.S. engineering company KBR Inc to help it build 17 modular refineries, as part of the U.S.-Indonesia trade deal, Reuters reported on Tuesday, citing sources with knowledge of the plans and a government presentation it has seen. Last week, Indonesia and the United States reached a trade deal, under which the U.S. tariffs on Indonesian products will be lowered to 19% from an initial levy of 32%. Indonesia was slapped with one of the highest tariffs - 32% - in the “liberation…