fix: don't modify history state when loading toolbar

[panrafal]

Modifying state may break on applications that use it, like Next.js.

Changes

Reuses the current history state when calling replaceState that removes hash from the URL.

Next.js apps rely on the state object. Calling replaceState("", ...) throws making the toolbar unusable.

...

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

@panrafal is attempting to deploy a commit to the PostHog Team on Vercel.

A member of the Team first needs to authorize it.

[pauldambra]

this seems totally reasonable based on the docs

[pauldambra]

I'm going to merge this without publishing a new version so I can check the tests without messing around :)