slapos_erp5: Reintroduce roles for Web Pages.

master/bt5/slapos_erp5/PortalTypeRolesTemplateItem/Web%20Page%20Module.xml

+<type_roles>
+  <role id='Author; Auditor'>
+   <property id='title'>Group company</property>
+   <multi_property id='categories'>local_role_group/group</multi_property>
+   <multi_property id='category'>group/company</multi_property>
+   <multi_property id='base_category'>group</multi_property>
+  </role>
+</type_roles>
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master/bt5/slapos_erp5/PortalTypeRolesTemplateItem/Web%20Page.xml

+<type_roles>
+  <role id='Assignor'>
+   <property id='title'>Group company</property>
+   <multi_property id='categories'>local_role_group/group</multi_property>
+   <multi_property id='category'>group/company</multi_property>
+   <multi_property id='base_category'>group</multi_property>
+  </role>
+</type_roles>
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