[FIX] account: create taxes at reconciliation

- Create an excluded tax of 20 %
- Create a customer invoice of 1000
- Create a payment of 900
- Make the matching between the invoice and the payment:
  Write-off of 83.33, with the 20 % tax

Error: 'Cannot create unbalanced journal entry'

After commit 89cbef8540, the tax are by default not created
automatically anymore. We should make sure to pass the context key
`apply_taxes`.

opw-744266

addons/account/models/account_move.py

@@ -962,7 +962,7 @@ class AccountMoveLine(models.Model):
             second_line_dict['amount_currency'] = -second_line_dict['amount_currency']
 
         # Create the move
-        writeoff_move = self.env['account.move'].create({
+        writeoff_move = self.env['account.move'].with_context(apply_taxes=True).create({
             'journal_id': vals['journal_id'],
             'date': vals['date'],
             'state': 'draft',