fix: only add to window when it exists

[pauldambra]

We add error functions to window even when it is undefined... let's copy the other entrypoints and check first

(should) fixes #1349

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Aug 16, 2024 9:31am

[github-actions]

Size Change: +11 B (0%)

Total Size: 1.17 MB

Filename	Size	Change
dist/array.full.js	333 kB	+6 B (0%)
dist/exception-autocapture.js	10.4 kB	+5 B (+0.05%)

ℹ️ View Unchanged

Filename	Size
dist/array.js	154 kB
dist/main.js	155 kB
dist/module.js	154 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	59.8 kB
dist/surveys.js	66 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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