fix: get computed style error

[pauldambra]

see https://posthog.sentry.io/issues/5858293571/events/latest/?project=1899813&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D+getComputedStyle&referrer=latest-event&statsPeriod=90d&stream_index=0&utc=true

and https://posthoghelp.zendesk.com/agent/tickets/17649

we very infrequently see a Window.getComputedStyle: Argument 1 does not implement interface Element. error.

there are some small differences between similar routes in heatmaps and autocapture

the error seems to be in autocapture, so let's make heatmaps safer

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Sep 23, 2024 9:42pm

[github-actions[bot]]

Size Change: -378 B (-0.01%)

Total Size: 2.79 MB

Filename	Size	Change
dist/array.full.js	350 kB	-42 B (-0.01%)
dist/array.full.no-external.js	348 kB	-42 B (-0.01%)
dist/array.js	165 kB	-42 B (-0.03%)
dist/array.no-external.js	164 kB	-42 B (-0.03%)
dist/main.js	165 kB	-42 B (-0.03%)
dist/module.full.js	349 kB	-42 B (-0.01%)
dist/module.full.no-external.js	348 kB	-42 B (-0.01%)
dist/module.js	165 kB	-42 B (-0.03%)
dist/module.no-external.js	164 kB	-42 B (-0.03%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/all-external-dependencies.js` | 191 kB | | `dist/exception-autocapture.js` | 10.5 kB | | `dist/external-scripts-loader.js` | 2.35 kB | | `dist/recorder-v2.js` | 111 kB | | `dist/recorder.js` | 111 kB | | `dist/surveys-preview.js` | 59.8 kB | | `dist/surveys.js` | 66 kB | | `dist/tracing-headers.js` | 8.36 kB | | `dist/web-vitals.js` | 10.3 kB |

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[sentry-io[bot]]

Sentry Issue: POSTHOG-1KPQ