fixed createURL() for Firefox

[AchThomas]

window.location.origin is "null" (the literal string value) in Firefox under certain conditions: https://bugzilla.mozilla.org/show_bug.cgi?id=878297

This leads to a broken app in Firefox when you build for production and try to use it from the local file system in an HTML file.

I added an additional check in createURL() in router.ts to respect that case.

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[remix-cla-bot]

Hi @AchThomas,

Welcome, and thank you for contributing to React Router!

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[brophdawg11]

Thanks!

[brophdawg11]

@AchThomas This is available in 6.4.3-pre.1 if you want to confirm that it's working!