[FIX] account: prepare_move_lines_for_reconciliation_widget

In the case where target_currency == company_currency, the actual_debit or the
actual_credit must be equal to the amount_residual defined on the account.move.line
and expressed in the currency of the company. The actual_debit/actual_credit must
take into account the possible partial reconciliations and this is done by the
residual amount.

opw:648744