remove the calendar base category on Assignment portal type because the...

remove the calendar base category on Assignment portal type because the relation between Assignment and Group Calendar is obsolete

bt5/erp5_calendar/bt/revision

-371
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+372
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bt5/erp5_calendar/bt/template_portal_type_base_category_list

-Assignment | calendar
 Group Calendar Module | business_application
 Leave Request Module | business_application
 Presence Request Module | business_application
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