Data.php

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<?php
namespace Magento\Captcha\Helper\Adminhtml;

class Data extends \Magento\Captcha\Helper\Data
{
    protected $_backendConfig;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Store\Model\StoreManager $storeManager,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Captcha\Model\CaptchaFactory $factory,
        \Magento\Backend\App\ConfigInterface $backendConfig
    ) {
        $this->_backendConfig = $backendConfig;
        parent::__construct($context, $storeManager, $filesystem, $factory);
    }

    public function getConfig($key, $store = null)
    {
        return $this->_backendConfig->getValue('admin/captcha/' . $key);
    }

    protected function _getWebsiteCode($website = null)
    {
        return 'admin';
    }
}