ERP5Workflow: rename forgotten my_default_expr to my_default_expression

bt5/erp5_workflow/SkinTemplateItem/portal_skins/erp5_workflow/TransitionVariable_view.xml

@@ -85,7 +85,7 @@
                       <list>
                         <string>my_causality</string>
                         <string>my_initial_value</string>
-                        <string>my_default_expr</string>
+                        <string>my_default_expression</string>
                       </list>
                     </value>
                 </item>

bt5/erp5_workflow/SkinTemplateItem/portal_skins/erp5_workflow/Variable_view.xml

@@ -93,7 +93,7 @@
                         <string>my_for_status</string>
                         <string>my_automatic_update</string>
                         <string>my_initial_value</string>
-                        <string>my_default_expr</string>
+                        <string>my_default_expression</string>
                       </list>
                     </value>
                 </item>

bt5/erp5_workflow/SkinTemplateItem/portal_skins/erp5_workflow/WorklistVariable_view.xml

@@ -85,7 +85,7 @@
                       <list>
                         <string>my_reference</string>
                         <string>my_initial_value</string>
-                        <string>my_default_expr</string>
+                        <string>my_default_expression</string>
                       </list>
                     </value>
                 </item>