Fix incorrect user online private message string (CnCNet#506)

* Fix incorrect user online private message string

Wrong message being displayed in private messages when user comes back online.

* Add "search all maps" toggle to game lobby

Based off @devo1929 CnCNet#328. This PR adds a checkbox. Another PR will be made to cncnet-yr-client-package with the layout information.

* Revert "Add "search all maps" toggle to game lobby"

This reverts commit a33d00b.

DXMainClient/DXGUI/Multiplayer/CnCNet/PrivateMessagingWindow.cs

@@ -314,7 +314,7 @@ private void ConnectionManager_UserAdded(object sender, UserEventArgs e)
 
             if (pmUser != null)
             {
-                joinMessage = new ChatMessage(string.Format("{0} is now offline.".L10N("Client:Main:PlayerOffline"), e.User.Name));
+                joinMessage = new ChatMessage(string.Format("{0} is now online.".L10N("Client:Main:PlayerOnline"), e.User.Name));
                 pmUser.Messages.Add(joinMessage);
             }