Editing Pending Transaction-wrong from account

When a pending contribution is updated and the status is left pending, eg. the payment instrument is changed, the new civicrm_financial_trxn has from_financial_account_id=6 (the default asset account) and to_financial_account_id=7 (A/R). They should both be 7 (A/R) because the status is not changing.

By contrast, updates to the payment instrument of a completed contribution result in the from and to accounts remaining the same in cases where the change in payment instrument does not change the account (eg from cash to cheque).

dgg: from a bookkeeping perspective these are null transactions. If you wanted, we could update the relevant civicrm_financial_trxn to reflect the new payment instrument rather than create a new record with the new value. But that seems like more work at this point.