remove empty LocalRolesTemplateItem

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13014 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_immobilisation/LocalRolesTemplateItem/.xml

-<local_roles_item>
- <local_roles>
-  <role id='admin'>
-   <item>Owner</item>
-  </role>
- </local_roles>
- <group_local_roles>
- </group_local_roles>
-</local_roles_item>
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