Revert "Remove receipt page links' bottom borders"

This reverts commit 01e21049.

lms/djangoapps/commerce/models.py

@@ -35,7 +35,7 @@ class CommerceConfiguration(ConfigurationModel):
     )
     receipt_page = models.CharField(
         max_length=255,
-        default='/commerce/checkout/receipt/?order_number=',
+        default='/commerce/checkout/receipt/?orderNum=',
         help_text=_('Path to order receipt page.')
     )
 

lms/djangoapps/student_account/test/test_views.py

@@ -573,7 +573,7 @@ class AccountSettingsViewTest(ThirdPartyAuthTestMixin, TestCase, ProgramsApiConf
                 'price': user_order['total_excl_tax'],
                 'title': user_order['lines'][0]['title'],
                 'order_date': 'Jan 01, 2016',
-                'receipt_url': '/commerce/checkout/receipt/?order_number=' + user_order['number']
+                'receipt_url': '/commerce/checkout/receipt/?orderNum=' + user_order['number']
             }
         ]
         self.assertEqual(order_detail, expected)