If ttyd is configured to ssl, you will get the following message in the
log `refuse to serve WS client for illegal ws path`. Upstream a patch
has already been applied which fixes this.

Since there is no newer version than 1.6.1, this fix is backported as a
patch. And could be removed if a new version of ttyd is available.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>