fix: Sanitize jsURL

[timgl]

Problem

Changes

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Does this work well for both Cloud and self-hosted?

How did you test this code?

[posthog-bot]

Hey @timgl! 👋
This pull request seems to contain no description. Please add useful context, rationale, and/or any other information that will help make sense of this change now and in the distant Mars-based future.

[github-actions]

Size Change: +61 B (+0.01%)

Total Size: 1.15 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.15 MB	+61 B (+0.01%)

_{compressed-size-action}