Add http tracker announce url to warning messages.

[crass]

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

[ ] Documentation update
[ ] Bug fix
[ ] New feature
[X] Other, please explain: Warning message improvement

What changes did you make? (Give an overview)
Add http tracker announce url to warning messages. This change is modeled on the way that the UDP tracker does warning messages. Also, add missing space to one of the error messages.

[github-actions]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

[crass]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

Yes, it is still relevant.

[alxhotel]

@crass maybe change it to onWarning

[crass]

@crass maybe change it to onWarning

Am I correct to understand you to be suggesting that I change onError to onWarning?

As stated in the PR this is how the udp tracker does it. So for consistency, in my opinion, this should only be changed if and only if the udp tracker is also changed. Are you suggesting that also?

Here's the onError function in the udp tracker which is virtually the same as the one in this PR:

bittorrent-tracker/lib/client/udp-tracker.js

Lines 165 to 175 in 295c69a

	function onError (err) {
	cleanup()
	if (self.destroyed) return
	try {
	// Error.message is readonly on some platforms.
	if (err.message) err.message += ` (${self.announceUrl})`
	} catch (ignoredErr) {}
	// errors will often happen if a tracker is offline, so don't treat it as fatal
	self.client.emit('warning', err)
	}