[FIX] account: add support for format like 045-001-000002

Before this fix, the prefix was detected as `045-0` and the year as `1`
instead of no year with prefix `045-001`.

opw-2381351

closes odoo/odoo#61882

Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>