Follow ConstraintMixin bug fix. Do not have to keep the bug behavior.

The previous test is based on the wrong usage of asContext at ConstraintMixin.applyOnAccessorHolder.
It was fixed at 7634c000.

product/ERP5Type/tests/testConstraint.py

@@ -1408,7 +1408,7 @@ class TestConstraint(PropertySheetTestCase):
     message = consistency_message_list[0]
     from Products.ERP5Type.ConsistencyMessage import ConsistencyMessage
     self.assertTrue(isinstance(message, ConsistencyMessage))
-    self.assertEquals(message.class_name, 'Temporary Attribute Equality Constraint')
+    self.assertEquals(message.class_name, 'Attribute Equality Constraint')
     obj.setTitle('a')
     self.assertEquals(obj.checkConsistency(), [])