restart the game instead of unmounting on the fly

avoid more redundancy between the load screens

OpenRA.Mods.RA/Widgets/Logic/MainMenuLogic.cs

@@ -54,7 +54,7 @@ namespace OpenRA.Mods.RA.Widgets.Logic
 			mainMenu.Get<ButtonWidget>("MODS_BUTTON").OnClick = () =>
 			{
 				Game.Settings.Game.PreviousMod = Game.modData.Manifest.Mod.Id;
-				Game.InitializeWithMod("modchooser", null);
+				Game.InitializeMod("modchooser", null);
 			};
 
 			mainMenu.Get<ButtonWidget>("SETTINGS_BUTTON").OnClick = () =>