[DB] Remove unused variable

[eduard13]

Description (*)

This PR removes the unused $columns variable

Fixed Issues (if relevant)

N/A

Manual testing scenarios (*)

1. ...
2. ...

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)

[magento-engcom-team]

Hi @eduard13. Thank you for your contribution
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[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-4483 has been created to process this Pull Request

[soleksii]

✔️ QA Passed

[ghost]

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