MAGETWO-45015: Unable to cancel billing agreement sign up after clicking Checkout with PayPal

- Fixed Incorrect function name

Author: Dell-

app/code/Magento/Paypal/view/frontend/web/js/paypal-checkout.js

@@ -53,7 +53,7 @@ define([
                              *
                              */
                             cancel: function () {
-                                self.redirect(returnUrl);
+                                self._redirect(returnUrl);
                             }
                         }
                     });