Fixed typo

Fixed typo where "files" should be "tfiles". Caused "TypeError: files is undefined" error

js/fileinput.js

@@ -1536,7 +1536,7 @@
                 return;
             }
             if (!self.isIE9) {
-                self.readFiles(files);
+                self.readFiles(tfiles);
             } else {
                 self.updateFileDetails(1);
             }
@@ -1774,4 +1774,4 @@
             $input.fileinput();
         }
     });
-})(window.jQuery);
+})(window.jQuery);