fix unused usings

Author: SamuelBellomo

Assets/BossRoom/Scripts/Client/UI/Lobby/LobbyUIMediator.cs

@@ -2,9 +2,7 @@
 using TMPro;
 using Unity.Multiplayer.Samples.BossRoom.Client;
 using Unity.Multiplayer.Samples.BossRoom.Shared.Infrastructure;
-using Unity.Multiplayer.Samples.BossRoom.Shared.Net.UnityServices.Infrastructure;
 using Unity.Multiplayer.Samples.BossRoom.Shared.Net.UnityServices.Lobbies;
-using Unity.Services.Lobbies;
 using Unity.Services.Lobbies.Models;
 using UnityEngine;