Fix for #12877 as per @azeemism

[jagritijoshi]

Description

Fixed Magento Database Backup Command Fails

Fixed Issues (if relevant)

1. [2.2.1] Magento Database Backup Command Fails (Fix included) #12877 : Magento Database Backup Command Fails (Fix included)

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-cicd2]

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