Fix "Add store details" task fails to mark as completed for selecting Nigeria based address

[chihsuan]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Closes #37451.

This PR updates the store details task completion logic only to check the post code field when it's not hidden.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Install and activate WooCommerce in a brand new site
2. Go to the WooCommerce onboarding wizard.

• You can do this by installing and activating WooCommerce in a brand new site.
• Or, via the WooCommerce ▸ Settings screen, locate the Help pulldown and re-run the wizard that way:

3. Select a Nigeria-based address and fill out all store details fields
4. Finish OBW.
5. Go to WooCommerce > Home
6. Observe that "Add store details" task is marked as completed.
7. Go to WooCommmerce > Settings and Change store country to United State
8. Go back to WooCommerce > Home
9. Observe that "Add store details" task is not marked as completed.
10. Click on "Add store details" task and fill out the post code field
11. Go back to WooCommerce > Home
12. Observe that "Add store details" task is marked as completed.

[github-actions]

Hi @moon0326, @rjchow, @woocommerce/ghidorah

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[github-actions]

Hi @moon0326, @rjchow, @woocommerce/ghidorah

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[github-actions]

Test Results Summary

Commit SHA: b38a9aa

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	267	0	0	2	0	269	0m 53s
E2E Tests	188	0	0	10	0	198	20m 30s

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To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[moon0326]

Thank you for working on the fix 👍 I like the logic.

LGTM and tested well 🚀

[rjchow]

Works! ✅