quic: remove noop code

this.unidirectional depends on #id which is never set
in the constructor, hence this condition will never run
and can be removed.

PR-URL: https://github.com/nodejs/node/pull/33914


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>