[IMP] base_user_role: use new optional feature to display role_ids fi…#438

legalsylvain wants to merge 1 commit intoOCA:16.0OCA/server-backend:16.0from

grap:16.0-IMP-base_user_role-tree-optional-SLGgrap/server-backend:16.0-IMP-base_user_role-tree-optional-SLGCopy head branch name to clipboard