fix bug

core-api/src/main/java/cn/com/qmth/examcloud/service/core/service/CourseService.java

@@ -76,6 +76,7 @@ public class CourseService {
 			dataSendService.sendCourse(tempCourse);
 		}else{
 			old.setName(course.getName());
+			old.setLevel(course.getLevel());
 			old.setUpdateTime(new Date());
 			Course tempCourse = courseRepo.save(old);
 			dataSendService.sendCourse(tempCourse);