fix: properly construct product selector URLs

[iansk]

The sidenav code added a forward slash (/) to the end of URLs in the product spreadsheet. The code should use the URLs as-is from the product spreadsheet

Test URLs:

• Before: https://main--prisma-cloud-docs-website--hlxsites.hlx.page/
• After: https://ian-fix-product-switcher--prisma-cloud-docs-website--hlxsites.hlx.page/

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