fix: added fake room for scenes with offline:offline adapter (#2492)

Explorer/Assets/DCL/Multiplayer/Connections/Archipelago/Rooms/ForkGlobalRealmRoom.cs

@@ -34,6 +34,8 @@ public async UniTask<bool> StartAsync()
                 current = wssRoomFactory();
             else if (adapterUrl.Contains("https://"))
                 current = httpsRoomFactory();
+            else if (adapterUrl.Contains("offline:offline"))
+                current = new IConnectiveRoom.Fake();
             else
                 throw new InvalidOperationException($"Cannot determine the protocol from the about url: {adapterUrl}");