Cross-server support - Velocity

Prior to switching from WaterFall to Velocity Herochat worked with cross-server as we could run it on the proxy. However switching to Velocity and attempting to use the cross-server function appears to do nothing and does not occur any errors on the main and proxy server.

Plugins/Server Jar Versions

```HeroChat-6.1.0-local

Paper 1.21.8 Build #60

Velocity 3.4.0 Build #555```

Snippet of config:

```use-cross-server: true

servername: survival

serveralias: '[CC]'

servers: survival, cedartest```

I have attempted different ways for servers and each time it removes the ‘ ‘.