Fix non-strict warning from AutoBahn
Fix non-strict warning from AutoBahn

When the reserved bits were set to 3, then the connection was aborted.
No a close message is sent before the connection is closed.

Change-Id: Iab365a4720c6588e5c6ac73813f63d26c3312265
Reviewed-by: Kurt Pattyn <da83d6ada5df79ff647b4271d0d788c6f1bafca2@gmail.com>

pixty/qtwebsockets,remimixlr/QtWebsocket,pixty/qtwebsockets,SfietKonstantin/qtwebsockets