fix tar entry mode creation

Author: jprante

src/main/java/org/xbib/io/archivers/tar/TarArchiveEntry.java

@@ -410,6 +410,9 @@ public String getName() {
      */
     public TarArchiveEntry setName(String name) {
         this.name = normalizeFileName(name, false);
+        boolean isDir = name.endsWith("/");
+        this.mode = isDir ? DEFAULT_DIR_MODE : DEFAULT_FILE_MODE;
+        this.linkFlag = isDir ? LF_DIR : LF_NORMAL;
         return this;
     }