Update failing mirroring test

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/mirroring/tests/test_filesystems.py

@@ -150,8 +150,5 @@ class IndexFilesystemTestCase(DocumentIndexingTestMixin, DocumentTestMixin, Base
 
         self.assertEqual(
             list(
-                index_filesystem.readdir(
+                index_filesystem.readdir('/', ''))[2:], []
-                    '/{}'.format(TEST_NODE_EXPRESSION), ''
-                )
-            )[2:], []
         )