ERP5Workflow: fix testBase and add comment

when removing a workflow from a portal type, it was only using old
chain_by_type and not removing them from inside the portal type
through the type_workflow value

product/ERP5/tests/testBase.py

@@ -134,6 +134,7 @@ class TestBase(ERP5TypeTestCase, ZopeTestCase.Functional):
     """
     self.getWorkflowTool().setChainForPortalTypes(
         ['Organisation'], ())
+    self.getPortalObject().portal_types.Organisation.setTypeWorkflowList([])
 
   def stepAssociateWorkflows(self, sequence=None, sequence_list=None, **kw):
     """
@@ -204,7 +205,7 @@ class TestBase(ERP5TypeTestCase, ZopeTestCase.Functional):
   def stepSetSameTitleValueWithEdit(self, sequence=None, sequence_list=None,
                                     **kw):
     """
-      Set a different title value
+      Set the same title value
     """
     object_instance = sequence.get('object_instance')
     object_instance.edit(title=object_instance.getTitle())