[FIX] sale_coupon: prevent program w/o company

The company is used to compute currency of:

- discount_fixed_amount
- discount_max_amount
- rule_minimum_amount

If currently we don't set a company, we have an error when using the
company.

opw-2458950

note: forward-port in master set the company field as required setting
it as required in the view.

closes odoo/odoo#66231

X-original-commit: d260dddcdeddecd2bc0649d948f5e0cc30607e09
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/coupon/models/coupon_program.py

@@ -47,7 +47,7 @@ class CouponProgram(models.Model):
         default='on_current_order', string="Applicability")
     coupon_ids = fields.One2many('coupon.coupon', 'program_id', string="Generated Coupons", copy=False)
     coupon_count = fields.Integer(compute='_compute_coupon_count')
-    company_id = fields.Many2one('res.company', string="Company", default=lambda self: self.env.company)
+    company_id = fields.Many2one('res.company', string="Company", required=True, default=lambda self: self.env.company)
     currency_id = fields.Many2one(string="Currency", related='company_id.currency_id', readonly=True)
     validity_duration = fields.Integer(default=30,
         help="Validity duration for a coupon after its generation")