修复导出附件所属学科专业类字段问题

server/cloud/tbook/func-tbook-export.js

@@ -306,7 +306,7 @@ function fixVolumeData(json,volumeData,index,totalJson){
     json.dn4 = disciplineName4;
     json.mc4 = disciplineCode4;
     json.mn4 = majorName4;
-    json.majorCodePad = majorCode4;
+    json.majorCodePad = disciplineCode4;
     json.mc6 = majorCode6;
     json.mn6 = majorName6;
     json.lCN = circleCheck[(volumeData?.lang=="中文")?1:0];