refactor(server): small adjustments

Author: xeruf

server/src/main/java/sc/server/Lobby.kt

@@ -24,8 +24,8 @@ class Lobby: GameRoomManager(), Closeable, IClientRequestListener {
 
     private fun notifyObservers(packet: ProtocolPacket) =
             clientManager.clients
-                    .filter { it.isAdministrator }
-                    .forEach { it.send(packet) }
+                    .filter(Client::isAdministrator)
+                    .forEach { admin -> admin.send(packet) }
 
     /** Handle requests or moves of clients.
      * @throws RescuableClientException if something goes wrong.

server/src/main/java/sc/server/network/ClientManager.kt

@@ -26,7 +26,7 @@ class ClientManager(private val requestHandler: IClientRequestListener) : Runnab
     /**
      * Adds the given `newClient` and listens to it.
      *
-     * *(only used by tests and addAll())*
+     * *(extracted from `run` for tests)*
      */
     fun add(newClient: Client) {
         clients.add(newClient)