qa: remove useless monkey-patch for checkMultipleUndoInOneTransaction

It should have been removed with commit cf32e594
(see also c277ed20 and related commits).

neo/tests/zodb/testZODB.py

@@ -30,19 +30,6 @@ class NEOZODBTests(ZODBTestCase, testZODB.ZODBTests):
         self._db.close()
         super(NEOZODBTests, self)._tearDown(success)
 
-    def checkMultipleUndoInOneTransaction(self):
-        # XXX: Upstream test accesses a persistent object outside a transaction
-        #      (it should call transaction.begin() after the last commit)
-        #      so disable our Connection.afterCompletion optimization.
-        #      This should really be discussed on zodb-dev ML.
-        from ZODB.Connection import Connection
-        afterCompletion = Connection.__dict__['afterCompletion']
-        try:
-            Connection.afterCompletion = Connection.__dict__['newTransaction']
-            super(NEOZODBTests, self).checkMultipleUndoInOneTransaction()
-        finally:
-            Connection.afterCompletion = afterCompletion
-
 if __name__ == "__main__":
     suite = unittest.makeSuite(NEOZODBTests, 'check')
     unittest.main(defaultTest='suite')