[FIX] account: make tax audit computation work with more complex CABA uses

Before this, it was impossible to reconcile an invoice with a credit note, as the tax_audit field's computation found two invoice lines while it expected only one, and crashed.

Note that our current tax report does still not handle all the cases properly:

- Invoices with negative lines using cash basis taxes won't work well, as we can't differentiate a credit note from an invoice using only debit and credit.

- Misc entries reconciled together with cash basis taxes on them ("faking" the invoice and payment) won't work well either, as both of them have the 'entry' type.

>> This commit is a temporary fix, essentially made to unlock customers blocked byt this issue. Another, more complete, fix is coming soon.

closes odoo/odoo#53238

X-original-commit: 8ed0ae8ba593c3b636c0b1e8d5bb41549a45a432
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>

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