Fix end game window conflicting with ingame menu

Fixes #6311

OpenRA.Mods.D2k/Widgets/Logic/IngameChromeLogic.cs

@@ -47,7 +47,7 @@ namespace OpenRA.Mods.D2k.Widgets.Logic
 
 			Action ShowLeaveRestartDialog = () =>
 			{
-				gameRoot.IsVisible = () => false;
+				gameRoot.RemoveChildren();
 				Game.LoadWidget(world, "LEAVE_RESTART_WIDGET", Ui.Root, new WidgetArgs());
 			};
 			world.GameOver += ShowLeaveRestartDialog;