fix replay black screen and replays exiting in the wrong menus

src/MarbleGame.hx

@@ -355,6 +355,13 @@ class MarbleGame {
 		paused = false;
 		if (watching) {
 			canvas.setContent(Type.createInstance(replayExitGui, []));
+
+			setPreviewMission(lastMis, () -> {
+				#if js
+				var pointercontainer = js.Browser.document.querySelector("#pointercontainer");
+				pointercontainer.hidden = false;
+				#end
+			});
 		} else {
 			if (Net.isMP) {
 				if (weDisconnecting) {

src/MarbleWorld.hx

@@ -1546,18 +1546,7 @@ class MarbleWorld extends Scheduler {
 				}
 				this.setCursorLock(false);
 				var misFile = haxe.io.Path.withoutExtension(haxe.io.Path.withoutDirectory(mission.path));
-				this.dispose();
+				MarbleGame.instance.quitMission();
-				MarbleGame.instance.setPreviewMission(misFile, () -> {
-					#if !js
-					MarbleGame.canvas.setContent(new ReplayCenterGui());
-					#end
-					#if js
-					MarbleGame.canvas.setContent(new MainMenuGui());
-					var pointercontainer = js.Browser.document.querySelector("#pointercontainer");
-					pointercontainer.hidden = false;
-					#end
-				});
-
 				return;
 			}
 		}

src/PreviewWorld.hx

@@ -134,6 +134,8 @@ class PreviewWorld extends Scheduler {
 		_loadToken++;
 		var groupName = (misname + "group").toLowerCase();
 		var group = levelGroups.get(groupName);
+		if (group == null)
+			group = levelGroups.get("urban"); // Use this as fallback
 		if (group != null) {
 			destroyAllObjects();
 			this.currentMission = misname;