SEOUL, South Korea — A South Korean charter plane left for the U.S. on Wednesday to bring back Korean workers detained in an immigration raid in Georgia last week, though officials said the return of the plane with the workers onboard will not happen as quickly as they had hoped. A total of 475 workers, more than 300 of them South Koreans, were rounded up in the Sept. 4 raid at the battery factory under construction at Hyundai’s sprawling auto plant. U.S. authorities released video showing some