[FIX] membership: `invoice_line` has been renamed to `invoice_line_ids`
[FIX] membership: `invoice_line` has been renamed to `invoice_line_ids`

This prevented the deletion of invoices when
the module membership was installed.

opw-671575

sysadminmatmoz/OCB,storm-computers/odoo,microcom/odoo,bplancher/odoo,microcom/odoo,bplancher/odoo,stephen144/odoo,laslabs/odoo,microcom/odoo,sysadminmatmoz/OCB,storm-computers/odoo,stephen144/odoo,dfang/odoo,stephen144/odoo,stephen144/odoo,dfang/odoo,dfang/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,dfang/odoo,ygol/odoo,laslabs/odoo,storm-computers/odoo,hip-odoo/odoo,storm-computers/odoo,storm-computers/odoo,bplancher/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,ygol/odoo,sysadminmatmoz/OCB,sysadminmatmoz/OCB,dfang/odoo,microcom/odoo,microcom/odoo,storm-computers/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,ygol/odoo,laslabs/odoo,laslabs/odoo,laslabs/odoo,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,laslabs/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,stephen144/odoo,ygol/odoo,hip-odoo/odoo,microcom/odoo,dfang/odoo,hip-odoo/odoo,stephen144/odoo,ygol/odoo