[FIX] l10n_ar_ux: forced currency rate on invoice

Ticket: 59842
Al forzar la moneda en factura no se toma esa cotización y al volver a la moneda anterior se actualizan incorrectamente los importes de las líneas.

account_ux/wizards/account_change_currency.py

@@ -54,6 +54,8 @@ def onchange_currency(self):
                 1.0, self.currency_to_id, self.move_id.company_id,
                 date=self.move_id.date or
                 fields.Date.context_today(self))
+            if self.move_id.company_currency_id == self.currency_to_id:
+                self.move_id.l10n_ar_currency_rate = 0
 
     def change_currency(self):
         self.ensure_one()
@@ -64,6 +66,7 @@ def change_currency(self):
             self.currency_rate)
 
         move = self.move_id.with_context(check_move_validity=False)
+        move.currency_id = self.currency_to_id.id
         for line in move.line_ids:
             # do not round on currency digits, it is rounded automatically
             # on price_unit precision