add migration path to old keyguard impl

Author: ajungg

ui/src/main/java/io/snabble/sdk/ui/Keyguard.java

@@ -18,6 +18,7 @@
 
 import java.util.concurrent.Executors;
 
+import io.snabble.sdk.Snabble;
 import io.snabble.sdk.utils.Dispatch;
 
 public class Keyguard {
@@ -111,6 +112,9 @@ private static void success(Callback callback) {
                 return;
             }
 
+            // migrate key store stored values to rsa stored values
+            Snabble.getInstance().getPaymentCredentialsStore().maybeMigrateKeyStoreCredentials();
+
             if (currentCallback != null) {
                 currentCallback.success();
                 currentCallback = null;