fix: bad rrweb patch

[pauldambra]

turns out in reality something we're relying on being defined isn't always defined
which didn't show up in testing :/

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Jan 24, 2025 8:31pm

[github-actions]

Size Change: +28 B (0%)

Total Size: 3.28 MB

Filename	Size	Change
dist/all-external-dependencies.js	209 kB	+4 B (0%)
dist/array.full.js	371 kB	+4 B (0%)
dist/array.full.no-external.js	369 kB	+4 B (0%)
dist/module.full.js	371 kB	+4 B (0%)
dist/module.full.no-external.js	369 kB	+4 B (0%)
dist/recorder-v2.js	117 kB	+4 B (0%)
dist/recorder.js	117 kB	+4 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/array.full.es5.js	266 kB
dist/array.js	182 kB
dist/array.no-external.js	180 kB
dist/customizations.full.js	13.8 kB
dist/dead-clicks-autocapture.js	14.4 kB
dist/exception-autocapture.js	9.48 kB
dist/external-scripts-loader.js	2.64 kB
dist/main.js	183 kB
dist/module.js	182 kB
dist/module.no-external.js	181 kB
dist/surveys-preview.js	67.5 kB
dist/surveys.js	64.2 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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