fix one click payment popup issue (#126)

Author: jshawl

save-payment-method/server/views/checkout.ejs

@@ -9,7 +9,7 @@
     <div id="paypal-button-container"></div>
     <p id="result-message"></p>
     <script
-      src="https://www.paypal.com/sdk/js?client-id=<%= clientId %>&vault=true"
+      src="https://www.paypal.com/sdk/js?client-id=<%= clientId %>"
       data-user-id-token="<%= userIdToken %>"
     ></script>
     <script src="app.js"></script>