[Backport] Fix incorrect image magnifier size bug in Safari

[dannynimmo]

Description

Back-port pull request #17426

Fixed Issues

1. Product image zoom (magnifier) is broken in Safari #17416: Product image zoom (magnifier) is broken in Safari

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 @dannynimmo. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

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[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-2737 has been created to process this Pull Request

[magento-engcom-team]

Hi @dannynimmo. Thank you for your contribution.
We will aim to release these changes as part of 2.2.7.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.