Cleanup "isAjax" from params in Router::reverseArray().

Refs #13661

src/Routing/Router.php

@@ -851,6 +851,7 @@ class Router
             $params['bare'],
             $params['requested'],
             $params['return'],
+            $params['isAjax'],
             $params['_Token'],
             $params['_csrfToken'],
             $params['_matchedRoute'],

tests/TestCase/Routing/RouterTest.php

@@ -2794,6 +2794,7 @@ class RouterTest extends TestCase
             'requested' => 1,
             '_Token' => ['key' => 'sekret'],
             '_csrfToken' => 'foo',
+            'isAjax' => true,
         ];
         $result = Router::reverse($params);
         $this->assertEquals('/posts/view/1', $result);