Display the selector in all menus. Fix information leakage from previous mod.

OpenRA.Mods.RA/OpenWidgetAtGameStart.cs

@@ -9,6 +9,7 @@
 #endregion
 
 using OpenRA.Traits;
+using OpenRA.Widgets;
 
 namespace OpenRA.Mods.RA
 {
@@ -30,6 +31,9 @@ namespace OpenRA.Mods.RA
 		
 		public void WorldLoaded(World world)
 		{
+			// Remove all open widgets
+			Widget.RootWidget.Children.Clear();
+			
 			if (world.LocalPlayer != null)
 				Game.OpenWindow(world, Info.Widget);
 			else if (Info.ObserverWidget != null)