erp5_workflow: fix configuration transition view.

bt5/erp5_workflow/ActionTemplateItem/portal_types/Configuration%20Transition/view.xml

@@ -13,11 +13,17 @@
             </value>
         </item>
         <item>
-            <key> <string>category</string> </key>
+            <key> <string>categories</string> </key>
             <value>
-              <none/>
+              <tuple>
+                <string>action_type/object_view</string>
+              </tuple>
             </value>
         </item>
+        <item>
+            <key> <string>category</string> </key>
+            <value> <string>object_view</string> </value>
+        </item>
         <item>
             <key> <string>condition</string> </key>
             <value> <string></string> </value>