fix: Inability to default to the utp peer type

[SilentBot1]

What is the purpose of this pull request? (put an "X" next to item)

• Documentation update
• Bug fix
• New feature
• Other, please explain:

What changes did you make? (Give an overview)
Currently, due to hostonly being defined when client.blocked is truthy and client.blocked only being truthy when opts.blocklist is passed to the construction of the client, we could only successfully default to utp in edge cases.

webtorrent/lib/torrent.js

Lines 843 to 870 in 45b3b1a

	let host
	if (this.client.blocked) {
	if (typeof peer === 'string') {
	let parts
	try {
	parts = addrToIPPort(peer)
	} catch (e) {
	this._debug('ignoring peer: invalid %s', peer)
	this.emit('invalidPeer', peer)
	return false
	}
	host = parts[0]
	} else if (typeof peer.remoteAddress === 'string') {
	host = peer.remoteAddress
	}
	if (host && this.client.blocked.contains(host)) {
	this._debug('ignoring peer: blocked %s', peer)
	if (typeof peer !== 'string') peer.destroy()
	this.emit('blockedPeer', peer)
	return false
	}
	}
	// if the utp connection fails to connect, then it is replaced with a tcp connection to the same ip:port
	const type = (this.client.utp && this._isIPv4(host)) ? 'utp' : 'tcp'

webtorrent/index.js

Lines 170 to 183 in 45b3b1a

	if (typeof loadIPSet === 'function' && opts.blocklist != null) {
	loadIPSet(opts.blocklist, {
	headers: {
	'user-agent': `WebTorrent/${VERSION} (https://webtorrent.io)`
	}
	}, (err, ipSet) => {
	if (err) return console.error(`Failed to load blocklist: ${err.message}`)
	this.blocked = ipSet
	ready()
	})
	} else {
	queueMicrotask(ready)
	}
	}

In this PR, I make changes to ensures we always populate host, which allows the correct peer type to be defaulted.

Note: Defaulting to uTP in WebTorrent's current implementation, if a peer only supports TCP, it would take >21 seconds to fall back to a TCP connection. Due to this, I would recommend holding off this for the moment.

Which issue (if any) does this pull request address?

Is there anything you'd like reviewers to focus on?