fix(core): update inventory logic for out-of-stock again

[chanceaclark]

What/Why?

Fixes it again... The PLP page was showing out of stock options even though they were in stock.

Testing

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3f566e1

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-j3fbx3yym-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟢 Performance	100
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟠 Performance	88
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	85