[IMP] point_of_sale: rec_name for report.pos.order

before this commit, on opening the form of
report.pos.order model the breadcrump is
shown as report.pos.order(1) , ie, model_name id

after this commit, the rec_name (order number) is set
for the model and clean breadrcump will be shown

Part-of: odoo/odoo#126003

addons/point_of_sale/report/pos_order_report.py

@@ -9,6 +9,7 @@ class PosOrderReport(models.Model):
     _description = "Point of Sale Orders Report"
     _auto = False
     _order = 'date desc'
+    _rec_name = 'order_id'
 
     date = fields.Datetime(string='Order Date', readonly=True)
     order_id = fields.Many2one('pos.order', string='Order', readonly=True)