erp5_catalog: Remove manage_schema option, instead use manage_overview

manage_schema is not needed in case of CatalogTool for now.

product/ERP5Catalog/CatalogTool.py

@@ -333,8 +333,8 @@ class CatalogTool (ZCatalog, CMFCoreCatalogTool, BaseTool):
     manage_catalogFind = CMFCoreCatalogTool.manage_catalogFind
 
     security.declareProtected(Permissions.ManagePortal
-                , 'manage_schema')
-    manage_schema = DTMLFile('dtml/manageSchema', globals())
+                , 'manage_overview')
+    manage_overview = DTMLFile('dtml/explainCatalogTool', globals())
 
     objectValues = BaseTool.objectValues