fix: 课程列表默认排序，只保留系统创建时长倒排

servers/boe-server-all/src/main/java/com/xboe/module/course/dao/CourseDao.java

@@ -362,7 +362,7 @@ public class CourseDao extends BaseDao<Course> {
 				builder.append("c.").append(orderFieldSql).append(" ").append(orderAscStr).append(", ");
 			}
 		}
-		builder.append("c.is_top DESC, c.sort_weight ASC, c.sys_create_time DESC");
+		builder.append("c.sys_create_time DESC");
 	}
 
 	private void setQueryParams(Query query,