Fix JavaScriptVisitor bug (#217)

* Fix `JavaScriptVisitor` bug

The `JS.ArrowFunction#body` property was visited twice.

* Polish

Author: knutwannheden

rewrite-javascript/src/main/java/org/openrewrite/javascript/JavaScriptVisitor.java

@@ -93,16 +93,15 @@ public J visitArrowFunction(JS.ArrowFunction arrowFunction, P p) {
                 )
         );
         a = a.withParameters(
-                a.getParameters().getPadding().withParams(
-                        Objects.requireNonNull(ListUtils.map(a.getParameters().getPadding().getParams(),
+                a.getParameters().getPadding().withParameters(
+                        Objects.requireNonNull(ListUtils.map(a.getParameters().getPadding().getParameters(),
                                 param -> visitRightPadded(param, JRightPadded.Location.LAMBDA_PARAM, p)
                         ))
                 )
         );
         a = a.withParameters(Objects.requireNonNull(visitAndCast(a.getParameters(), p)));
         a = a.withReturnTypeExpression(visitAndCast(a.getReturnTypeExpression(), p));
         a = a.getPadding().withBody(Objects.requireNonNull(visitLeftPadded(a.getPadding().getBody(), JsLeftPadded.Location.LAMBDA_ARROW, p)));
-        a = a.withBody(Objects.requireNonNull(visitAndCast(a.getBody(), p)));
         a = a.withType(visitType(a.getType(), p));
         return a;
     }