Fix new section in payments tab not working

[ghost]

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Changes proposed in this Pull Request:

Change the logic in the class-wc-settings-payment-gateways.php file so that new sections created under the Payments tab will work correctly. This was an existing bug in WC 3.5.3 that was later fixed with this PR: woocommerce/woocommerce#22988

How to test the changes in this Pull Request:

1. Copy the revised class-wc-settings-payment-gateways.php file to a test installation
2. Create a new section following this tutorial: https://docs.woocommerce.com/document/adding-a-section-to-a-settings-tab/

• make sure you use the woocommerce_get_sections_checkout filter.

3. Visit the Payments tab in the setting and ensure that the new section is showing and the screen displays correctly when clicked.

Screenshot - before:

Screenshot - after:

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?
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Discussion on forum is here: https://forums.classicpress.net/t/classiccommerce-not-triggering-filter-for-adding-settings-sections-in-tabs/3508

Thanks to arnandegans for bringing it to our attention.

[ClassyBot]

This pull request has been mentioned on ClassicPress Forums. There might be relevant details there:

https://forums.classicpress.net/t/classiccommerce-not-triggering-filter-for-adding-settings-sections-in-tabs/3508/15

[bahiirwa]

Thanks for raising this @simplycomputing. The solution made is solid.

Adding these for the sake of the history:
woocommerce/woocommerce@2abf39c woocommerce/woocommerce@0211757