fix：

修复xls文件无法上传的问题

tr-framework/src/main/java/cn/tr/core/utils/MediaTypeUtils.java

@@ -56,7 +56,7 @@ public class MediaTypeUtils {
 
         RTF("rtf","application/rtf"),
 
-        XLS("xls","application/vnd.ms-excel application/x-excel"),
+        XLS("xls","application/vnd.ms-excel"),
         XLSX("xlsx","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
 
         PPT("ppt","application/vnd.ms-powerpoint"),