[FIX] account: initial balance has a 0 amount_currency
[FIX] account: initial balance has a 0 amount_currency

amount_currency is a field that is expected in multi-currency
The general ledger report has a line
    <span t-esc="line['amount_currency'] if line['amount_currency'] > 0.00 else ''"/>
which crashes if amount_currency is None

opw-1859122

Replaces and closes #25240

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo