Octopus.Server.exe configure --webAuthenticationMode "Domain" is deprecated

The cookbook runs this command which will be deprecated in 4.x


```
.\Octopus.Server.exe configure --webAuthenticationMode "Domain"
--webAuthenticationMode has been deprecated and will be removed in Octopus 4.0. Please enable and configure the individu
al authentication providers you wish to use. See http://g.octopushq.com/AuthenticationProviders
```