Removed unused variables

[gy741]

Description

Hello,

In my opinion, No $key variables are required.

Because it is not used.

What do you think of it?

Thanks.

Fixed Issues (if relevant)

N/A

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/verification tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)
• Changes to Framework doesn't have backward incompatible changes for tests or have related Pull Request with fixes to tests

[magento-cicd2]

All committers have signed the CLA.

[coveralls]

Coverage remained the same at 57.482% when pulling 0972b86 on gy741:remove_dead_code into f0779ac on magento:develop.

[KevinBKozan]

@gy741 Thank you for your contribution! We will update this PR with progress information as we process it.