By Karl Plume CHICAGO, Dec 9 (Reuters) - The U.S. Department of ​Agriculture left its U.S. soybean ‌export forecast unchanged in a monthly report ‌on Tuesday as sales to China have resumed after the top importer shunned purchases for months amid ⁠a bruising ‌trade war with Washington. But the agency raised its U.S. ‍corn export forecast as sales of the grain have been stronger than ​anticipated. The USDA pegged soybean exports ‌in the 2025/26 season that ends on August 31 at 1.635 billion bushels. Endin ...