[FIX] event_sale: traceback

- Go in Events > Events
- Create or modify an event
- Add a ticket to your event, and try to change the product -> traceback

The field `event_type_id` does not exist on model `product.product`. It
has been removed in commit 7f97a64091.

opw-704838

addons/event_sale/models/event.py

@@ -36,7 +36,7 @@ class EventTicket(models.Model):
     name = fields.Char(string='Name', required=True, translate=True)
     event_id = fields.Many2one('event.event', string="Event", required=True, ondelete='cascade')
     product_id = fields.Many2one('product.product', string='Product',
-        required=True, domain=["|", ("event_type_id", "!=", False), ("event_ok", "=", True)],
+        required=True, domain=[("event_ok", "=", True)],
         default=_default_product_id)
     registration_ids = fields.One2many('event.registration', 'event_ticket_id', string='Registrations')
     price = fields.Float(string='Price', digits=dp.get_precision('Product Price'))