[FIX] pos_restaurant: missing fields note, mp_skip

The note and mp_skip field of pos.order.line only exist in the frontend
application, this causes errors in some task of the PoS and IoT teams.

This pr adds the fields to the database, resolving these problems.

closes odoo/odoo#34210

Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>

addons/pos_restaurant/models/pos_order.py

@@ -4,6 +4,13 @@
 from odoo import api, fields, models
 
 
+class PosOrderLine(models.Model):
+    _inherit = 'pos.order.line'
+
+    note = fields.Char('Note added by the waiter.')
+    mp_skip = fields.Boolean('Skip line when sending ticket to kitchen printers.')
+
+
 class PosOrder(models.Model):
     _inherit = 'pos.order'