fix: incorrect destructuring in netlify build

[jasonbarry]

Summary

Fixes https://github.com/netlify/pillar-workflow/issues/813

Typo in destructuring introduced in #4949 led to unexpected behavior

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[github-actions]

📊 Benchmark results

Comparing with 8b8d8b3

Package size: 222 MB

(no change)

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• T-30 (d2d7665): 222 MB
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• T-12 (c6eb30e): 222 MB
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• T-9 (8e50080): 222 MB
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• T-5 (3af976e): 222 MB
• T-4 (7a2af72): 222 MB
• T-3 (6fad2a8): 222 MB
• T-2 (1450e1e): 222 MB
• T-1 (8b8d8b3): 222 MB
• T (current commit): 222 MB

[melanierichards]

Addresses the issue where env vars with contextual values don't print correctly, thank you!