Remove wrong test expectation

[markshust]

Description (*)

Removing wrong test expectation which fails unit tests

Fixed Issues (if relevant)

1. Fixes Fails and warnings while running unit tests #12419

Manual testing scenarios (*)

1. Run bin/magento dev:tests:run unit, which fails with:

There was 1 failure:

1) Magento\ProductVideo\Test\Unit\Controller\Adminhtml\Product\Gallery\RetrieveImageTest::testExecute
Expectation failed for method name is equal to <string:getDirectoryWrite> when invoked 1 time(s).
Method was expected to be called 1 times, actually called 0 times.

Contribution checklist (*)

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

[magento-cicd2]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
5 out of 16 committers have signed the CLA.

✅ dmytro-ch
✅ magento-engcom-team
✅ sidolov
✅ haroldclaus
✅ kriswolo
❌ viktym
❌ svitja
❌ zakdma
❌ okolesnyk
❌ yelahin-serhiy
❌ vgoncharenko
❌ OlgaVasyltsun
❌ mastiuhin-olexandr
❌ Mariana
❌ duhon
❌ magento-cicd2

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[magento-engcom-team]

Hi @markoshust. 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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