Import IgnoreListMessage in ignore.rb.

Import IgnoreListMessage (thanks lmctruck).

data/plugins/chat/private-messaging/ignore.rb

@@ -1,3 +1,5 @@
+java_import 'org.apollo.game.message.impl.IgnoreListMessage'
+
 on :message, :add_ignore do |ctx, player, message|
   username = message.username
   player.add_ignore(username)
@@ -6,4 +8,4 @@ end
 on :message, :remove_ignore do |ctx, player, message|
   username = message.username
   player.remove_ignore(username)
-end
+end