fix: use correct param name for vault with purchase flow (#168)

Author: gregjopa

client/components/paypalPayments/oneTimePaymentWithVault/html/src/recommended/app.js

@@ -79,7 +79,7 @@ const paymentSessionOptions = {
     });
     console.log("onError", error);
   },
-  vault: true,
+  savePayment: true,
 };
 
 async function setupPayPalButton(sdkInstance) {