BrowserWebSocketClientAdapter: Don't throw on unknown message type

[HerbCaudill]

This prevents an auth provider from sending auth messages.

It's not the network adapter's place to have opinions about messages that it doesn't handle internally -- it should just emit them and let listeners decide what to do with them.

It is the NetworkSubsystem's job to do this check, and it already does:

automerge-repo/packages/automerge-repo/src/network/NetworkSubsystem.ts

Lines 68 to 72 in 703bfa2

	networkAdapter.on("message", msg => {
	if (!isValidRepoMessage(msg)) {
	this.#log(`invalid message: ${JSON.stringify(msg)}`)
	return
	}