[winswitch] Disable TCP on systemd socket activation

[Michael Cronenworth]

On 11/24/20 8:56 AM, Antoine Martin via shifter-users wrote:
> Try replacing "--tcp-auth=$TCP_AUTH" with "--wss-auth=sys"
>
> We could make this the default too I guess - though it may be confusing
> to see an auth option defined for a socket type that isn't used by default.

Setting wss-auth allows login and everything else seems normal from starting apps to 
shutting down the server. Thanks.