fix bug:调卷规则导出试卷时，如果试卷中有音频，导出后没有音频文件.

examcloud-core-questions-service/src/main/java/cn/com/qmth/examcloud/core/questions/service/impl/ExtractConfigFileServiceImpl.java

@@ -266,7 +266,7 @@ public class ExtractConfigFileServiceImpl implements ExtractConfigFileService {
 											+"_试卷_"+examFile.getGroupCode()
 											+"_"+getAudioFileName(audio,unit);
 					UpYun upyun = new UpYun(bucketName,userName,password);
-					File file = new File(downloadDirectory+File.separator+audioFileName);
+					File file = new File(downloadDir+File.separator+audioFileName);
 					upyun.readFile(audio.getFileUrl(), file);
 					logger.info(audioFileName+"音频下载完成后返回");
 				}