[FIX] account: Fix reconciliation foreign currency on account

Suppose you make a reconciliation on an account having a foreign currency being
the same as the company one.
Suppose also you are making a reconciliation of three lines without currency_id set on this account:
- A with debit = 11
- B with credit = 10
- C with credit = 1

Before this commit, the reconciliation was wrong because all computation are made using the foreign
currency due to the account's configuration. As A, B & C have their amount_currency set to 0,
an account.full.reconcile is well created but only one account.partial.reconcile is created instead of
2 leading to an inconsistent state.

opw:1984684

closes odoo/odoo#33445

Signed-off-by: Simon Goffin (sig) <sig@openerp.com>


Co-authored-by: Goffin Simon <simon.goffin@outlook.com>