Small typo fix

Author: alundiak

js/jquery.fileupload.js

@@ -1130,7 +1130,7 @@
                 dirReader = entry.createReader();
                 readEntries();
             } else {
-                // Return an empy list for file system items
+                // Return an empty list for file system items
                 // other than files or directories:
                 dfd.resolve([]);
             }