[FIX] account: Exchanges rates gain/loss during reconciliations

When processing the reconciliation of a bank statement
within the company currency with an invoice in a foreign currency,
avoid to recompute the bank statement debit / credit within
the currency rate at the time of the invoice when the
`amount_currency` of the bank statement line and the `amount_currency`
of the invoice move line are the same
(while having the invoice move line and the
bank statement move line in the same currency,
and having the bank statement currency and
the company currency the same),
to prevent gain/loss exchanges during currencies conversion.

Computing the amount of the statement line
within the currency of the invoice is useful
to compute the difference of amount paid within the company currency
when a change of currency rates occured between the invoice date
and the date of the payment.

Nevertheless, recomputing the amount in the currency of the company
is useless when the payment currency
and the company currency are the same,
and the amount of the invoice and the statement in the foreign currency
are identical, since the amount is already computed, within the
debit/credit field of the invoice move line.

Besides, this prevents gain/loss changes.
opw-631748
opw-632133
opw-631895
closes #6559

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