Drop not needed role definition.

Computer doesn't need to access Hosting Subscription, as SlapTool only access
Partitions and Instances.

master/bt5/slapos_erp5/PortalTypeRolesTemplateItem/Hosting%20Subscription.xml

 <type_roles>
-  <role id='Auditor'>
-   <property id='title'>Computer</property>
-   <property id='base_category_script'>ERP5Type_getSecurityCategoryFromAggregateMovementItemByComputerPartition</property>
-   <multi_property id='base_category'>aggregate</multi_property>
-  </role>
   <role id='Assignee'>
    <property id='title'>Customer of the Hosting Subscription</property>
    <property id='description'>ERP5Type_getSecurityCategoryFromAggregateMovementItemByPerson</property>

master/bt5/slapos_erp5/bt/revision

-3
+4
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