[Forwardport] Fix typo in securityCheckers array

[AlexWorking]

Original Pull Request
#13897

Description
Update wuantity to quantity to match the key used in https://github.com/magento/magento2/blob/4cfedb97d92b887e68a8d9c2f14bf75f1854ba0c/app/code/Magento/Security/etc/di.xml

Fixed Issues (if relevant)
n/a

Manual testing scenarios
Set admin reset quantity limits
Attempt exceeding admin password reset quantity limit
Should continue to work as it did before

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)