Fix additional typo

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/commands/BasicCommand.java

@@ -56,7 +56,7 @@ abstract class BasicCommand extends Command implements TabExecutor {
     protected SteamwarUser user(CommandSender sender, String arg){
         SteamwarUser target = SteamwarUser.get(arg);
         if(target == null)
-            Message.send("UNKNWON_PLAYER", sender);
+            Message.send("UNKNOWN_PLAYER", sender);
         return target;
     }
 }