Direct OnClientDisconnected calls in connectionSetupTask

[xPaw]

Like this:

SteamKit/SteamKit2/SteamKit2/Steam/CMClient.cs

Lines 191 to 197 in 9811319

	connectionSetupTask = recordTask.ContinueWith( t =>
	{
	if ( token.IsCancellationRequested )
	{
	LogDebug( nameof( CMClient ), "Connection cancelled before a server could be chosen." );
	OnClientDisconnected( userInitiated: true );
	return;

This bypasses the normal Disconnect call which means some of the objects like connectionCancellation linger around. There's a call to Disconnect() in Connect, so there's no blocking, but if there wasn't it would just crash.

Not really sure what's a clean way to fix this up because Disconnect joins connectionSetupTask, so it would just dead lock.