fix inversed logic for adding stockstatus for configurable product subitems

[brosenberger]

Description

• the current logic is inversed as it will add the filter for stock only elements when the option is activated

Fixed Issues (if relevant)

1. Configurable product price is not displayed if all children are out of stock and even if Display Out of Stock Products is set to "yes" #16069: Configurable product price is not displayed if all children are out of stock and even if Display Out of Stock Products is set to "yes"

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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[magento-engcom-team]

Hi @brosenberger. 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:

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[sidolov]

Hi @brosenberger , looks like inverted logic cause a lot of tests failing, can you take a look at failed tests?
Thanks!

[sidolov]

Hi @brosenberger , I am closing this PR now due to inactivity.
Please reopen and update if you wish to continue.
Thank you for the collaboration!