fix(nuxt): normalise window location for universal router

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

currently route.fullPath is / on server and http://localhost:3000/ on client. This implements same behaviour as on router, which also fixes an issue where baseURL wasn't being correctly handled with universal router:

framework/packages/nuxt/src/pages/runtime/router.ts

Lines 30 to 49 in ebc27ce

	// https://github.dev/vuejs/router/blob/main/src/history/html5.ts#L33-L56
	function createCurrentLocation (
	base: string,
	location: Location
	): string {
	const { pathname, search, hash } = location
	// allows hash bases like #, /#, #/, #!, #!/, /#!/, or even /folder#end
	const hashPos = base.indexOf('#')
	if (hashPos > -1) {
	const slicePos = hash.includes(base.slice(hashPos))
	? base.slice(hashPos).length
	: 1
	let pathFromHash = hash.slice(slicePos)
	// prepend the starting slash to hash so the url starts with /#
	if (pathFromHash[0] !== '/') { pathFromHash = '/' + pathFromHash }
	return withoutBase(pathFromHash, '')
	}
	const path = withoutBase(pathname, base)
	return path + search + hash
	}

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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