Fix typo in wc_get_product_id_by_global_unique_id

[nathanss]

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:

Fix typo in wc_get_product_id_by_global_unique_id

How to test the changes in this Pull Request:

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

1. Go to Products > Add.
2. Create a product with a GTIN, UPC, EAN, or ISBN value
3. Publish it.
4. Try to create another product with the same value.
5. Check that you see the message 'Invalid or duplicated GTIN, UPC, EAN or ISBN.'.

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Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

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[vedanshujain]

LGTM! Seems to be working as expected, and method returns the product id with duplicate unique id.