[FIX] stock: typo in _get_orderpoint_date_planned
[FIX] stock: typo in _get_orderpoint_date_planned

orderpoint.lead_type should be 'supplier' instead of 'purchase'

opw-687311
Closes #11389

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