[FIX] account_invoice_report: fix group by product

Group by invoice, products: the untaxed total is correct,
while the (taxed) total is the sum of the lines divided by the number of lines.

On account.invoice.line, there is a price_subtotal_signed, which is the
price_subtotal (untaxed) in the company currency.
Unfortunately price_total_signed does not exist for price_total (untaxed).

As a result, we need to use the price_total on the invoice line,
and divide by the currency rate.
Unfortunately we cannot do it in the subquery because of the scope of the rate.

opw 2003185

closes odoo/odoo#33802

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

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