[FIX] payment_adyen: fix form behavior on error

on error unblock dispay and enable pay button to allow
user perform actions

closes odoo/odoo#127441

X-original-commit: 3bcb74438c8e29eb52c2e20c97dabca7a61a1dae
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

addons/payment_adyen/static/src/js/payment_form.js

@@ -59,6 +59,10 @@
                     _t("Please verify your payment details.")
                 );
             }
+            else {
+                this._enableButton();
+                $('body').unblock();
+            }
         },
 
         /**