Fix duplicated push history

[Legend-Master]

Fix #479

From debugging, it seems that we are changing the state to undefined here, while the state set from click events from anchor tags are from getAttribute which uses null, so the states are always different

solid-router/src/routers/Router.ts

Lines 15 to 19 in 24dbf2c

	const state = window.history.state && window.history.state._depth && Object.keys(window.history.state).length === 1 ? undefined : window.history.state;
	return {
	value: url + window.location.hash,
	state
	}

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Latest commit: 0a964b6

The changes in this PR will be included in the next version bump.

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Name	Type
@solidjs/router	Patch

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