Commit 27d41ccb introduced record rules on resource.calendar.leaves.
However it gave no way to create, edit or delete a global rule.
We grant this right to the group_erp_manager, so that an admin can do it.
opw 1968376
closes odoo/odoo#32832
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>