testERP5TestNode: undo patch in try/finally

otherwise it's not executed when test has an error.

We should consider using mock library here.

erp5/tests/testERP5TestNode.py

@@ -1126,9 +1126,11 @@ shared = true
     RunnerClass.getDictionaryFromFile = patch_getDictionaryFromFile
     RunnerClass._createInstance = doNothing
     RunnerClass._waitInstanceCreation = doNothing
+    try:
       # Run
       test_node = self.getTestNode()
       test_node.run()
+    finally:
       # Restore methods
       TaskDistributor.getSlaposAccountKey = original_getSlaposAccountKey
       TaskDistributor.getSlaposAccountCertificate = original_getSlaposAccountCertificate