[FIX][18.0] hr_expense_invoice: decimal discrepancy in expense reports

[dtec-landoo]

In the tests carried out on a hr_expense_invoice runboat, when expenses have a specific amount—for example, $10—at the moment we create the vendor bill from the expense report, there is a decimal discrepancy. This is incorrect. The tax configuration used for the invoice is set to "Default," as it comes in Odoo. You can find our example images attached. Thank you.

Thank you in avance
Best regards

@pedrobaeza @victoralmau @kittiu

[victoralmau]

#333