[FIX] account: duplicate journal should not use the same bank account
[FIX] account: duplicate journal should not use the same bank account

There is several override of create and write that assumes that a bank account
is present on only one account (see 4530e5d).
It is very hard to change or remove the account bank once linked to a journal
(see 4a65bc38) so it should not be set in the first place when duplicating a
journal.

opw-676374

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