Maint: Remove CYBERGHOST_GROUP (change)

- It does not make any sense with newer server data
- It was to be deprecated anyway

internal/updater/providers/cyberghost/sort.go

@@ -9,10 +9,7 @@ import (
 func sortServers(servers []models.CyberghostServer) {
 	sort.Slice(servers, func(i, j int) bool {
 		if servers[i].Country == servers[j].Country {
-			if servers[i].Group == servers[j].Group {
-				return servers[i].Hostname < servers[j].Hostname
-			}
-			return servers[i].Group < servers[j].Group
+			return servers[i].Hostname < servers[j].Hostname
 		}
 		return servers[i].Country < servers[j].Country
 	})