Fix recaptcha metabox non-HPOS

[AlexP11223]

Fixes #3914

There was an error when rendering the reCaptcha metabox if WC orders were using the legacy WordPress posts storage instead of the new High-Performance Order Storage.

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.3.1-pr3918-19964530069-g369b6d7 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.3.1-pr3918-19964530069-g369b6d7
• Commit: 369b6d7
• Artifact: woocommerce-paypal-payments-3.3.1-pr3918-19964530069-g369b6d7

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