Unmark fixed tests (RustPython#5818)

Author: moreal

Lib/test/test_descr.py

@@ -1851,8 +1851,6 @@ def __init__(self, foo):
         object.__init__(A(3))
         self.assertRaises(TypeError, object.__init__, A(3), 5)
 
-    @unittest.expectedFailure
-    @unittest.skip("TODO: RUSTPYTHON")
     def test_restored_object_new(self):
         class A(object):
             def __new__(cls, *args, **kwargs):