[FIX] sale: Correct the tax inclusion definition in the sales config

The commit 1b31635 introduces a switch between the definions of tax included and excluded.

As the default value wasn't coherent with the intended behavior, the commit 2e467a7 tries to fix this.

This commit is correct. Switch back the selection labels and set back the default value.

addons/sale/models/sale_config_settings.py

@@ -49,9 +49,9 @@ class SaleConfiguration(models.TransientModel):
         implied_group='sale.group_show_price_total',
         group='base.group_portal,base.group_user,base.group_public')
     sale_show_tax = fields.Selection([
-        ('subtotal', 'Tax-Included Prices'),
-        ('total', 'Tax-Excluded Prices')], "Tax Display",
-        default='total',
+        ('subtotal', 'Tax-Excluded Prices'),
+        ('total', 'Tax-Included Prices')], "Tax Display",
+        default='subtotal',
         required=True)
     default_invoice_policy = fields.Selection([
         ('order', 'Ordered quantities'),