[FIX] coupon: have default value of promo_code_usage

When creating a record from the menu named 'Coupon programs'
- Before fix:
  value of 'promo_code_usage' is blank
- After fix
  Value of 'promo_code_usage' is 'code_needed'

OPW-3460238

closes odoo/odoo#134350

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/coupon/views/coupon_program_views.xml

@@ -170,7 +170,7 @@
         <field name="domain">[('program_type','=', 'coupon_program')]</field>
         <field name="context">{
             'default_program_type': 'coupon_program',
-            'promo_code_usage': 'code_needed',
+            'default_promo_code_usage': 'code_needed',
             'search_default_opened': 1
             }</field>
         <field name="help" type="html">