Getting traceback when installing the l10n_ch module.
In the form view of journal, the field "l10n_ch_postal" is added using the xpath.
However the field provided in the expression of xpath('bank_acc_number') doesn't
seem to exist anymore in the form view of account journal.
Hence, it is replaced with the existing field('bank_account_id') in form view
of journal.
task-1999654
closesodoo/odoo#33702
Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>