[FIX] hr_expense: tax on expense

- Create an expense with a tax
- Validate and post entries

3 AML are created, one on the expense account, one on the account
payable, one for the tax. However, the AML of the expense account is not
linked to the tax, and therefore does not appear in the reports.

opw-715488

addons/hr_expense/models/hr_expense.py

@@ -289,7 +289,7 @@ class HrExpense(models.Model):
             # Calculate tax lines and adjust base line
             taxes = expense.tax_ids.compute_all(expense.unit_amount, expense.currency_id, expense.quantity, expense.product_id)
             account_move[-1]['price'] = taxes['total_excluded']
-            account_move[-1]['tax_ids'] = expense.tax_ids.ids
+            account_move[-1]['tax_ids'] = [(6, 0, expense.tax_ids.ids)]
             for tax in taxes['taxes']:
                 account_move.append({
                     'type': 'tax',