[FIX] account: fix 0% taxes shown on invoice print

- Install Invoicing
- Go to Invoicing > Configuration > Taxes
- Create a Tax 0% with its own tax group
- Go to Invoicing > Customers > Invoices
- Create an Invoice with a line having a normal Tax and several lines with Tax 0%
- Confirm and print Invoice
On the Subtotal section of the printed invoice, for the label of the Tax Group of Tax 0%,
only the amount of the first line having this tax is shown.
(i.e. "Tax 0% on $ XXX", where XXX should be the sum of all lines on which Tax 0% is applied)

opw-2381051

closes odoo/odoo#61856

Signed-off-by: Anh Thao PHAM <kitan191@users.noreply.github.com>