slapos_erp5: drop portal_gadget security

It is not used

master/bt5/slapos_erp5/LocalRolesTemplateItem/portal_gadgets.xml

-<local_roles_item>
- <local_roles>
-  <role id='G-COMPANY'>
-   <item>Auditor</item>
-   <item>Author</item>
-  </role>
- </local_roles>
- <local_role_group_ids>
-  <local_role_group_id id='group'>
-    <principal id='G-COMPANY'>Auditor</principal>
-    <principal id='G-COMPANY'>Author</principal>
-  </local_role_group_id>
- </local_role_group_ids>
-</local_roles_item>
\ No newline at end of file

master/bt5/slapos_erp5/PortalTypeRolesTemplateItem/Gadget%20Tool.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>
\ No newline at end of file

master/bt5/slapos_erp5/PortalTypeRolesTemplateItem/Gadget.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>
\ No newline at end of file