ENGCOM-5471: Remove duplicate declaration #23794

 - Merge Pull Request #23794 from gfernandes410/magento2:2.3-develop
 - Merged commits:
   1. 1d419dc

Author: magento-engcom-team

app/code/Magento/Backend/Block/Page/RequireJs.php

@@ -29,7 +29,6 @@ public function __construct(
         \Magento\Framework\Data\Form\FormKey $formKey,
         array $data = []
     ) {
-        $this->formKey = $formKey;
         parent::__construct(
             $context,
             $data