[FIX] account: include 'quantity' in '_compute_all_tax' dependencies

Summary
-------
This commit addresses an issue where fixed taxes were not calculated
correctly when applied to a line with a price of 0.

Steps to reproduce
------------------
1. Create a fixed tax with an amount of 5.
2. Create an invoice with a line having zero price and apply the fixed
   tax.
3. Save the invoice. You should have a total of 5.
4. Change the quantity of the invoice line, to something like 2.
5. Save the invoice.

We expect the total to be 10, but we get 5.

opw-3212536

closes odoo/odoo#134153

Signed-off-by: William André (wan) <wan@odoo.com>