Switch to only delete a pre auth if a card was successfully saved (APPS-1764) (#206)

Author: Fabtron

ui/src/main/java/io/snabble/sdk/ui/payment/creditcard/fiserv/FiservInputView.java

@@ -250,6 +250,7 @@ private void save(CreditCardInfo info) {
                     .show();
         } else {
             Snabble.getInstance().getPaymentCredentialsStore().add(pc);
+            deletePreAuth();
             Telemetry.event(Telemetry.Event.PaymentMethodAdded, pc.getType().name());
         }
 
@@ -261,7 +262,6 @@ private void save(CreditCardInfo info) {
     }
 
     private void finish() {
-        deletePreAuth();
         SnabbleUI.executeAction(getContext(), SnabbleUI.Event.GO_BACK);
     }