Fix fire'n'forget task from blocking guest logins.

Shogi.UI/Program.cs

@@ -51,7 +51,6 @@ static void ConfigureDependencies(IServiceCollection services, IConfiguration co
     });
 
     // https://docs.microsoft.com/en-us/aspnet/core/blazor/fundamentals/dependency-injection?view=aspnetcore-6.0#service-lifetime
-    services.AddScoped<ClientWebSocket>();
     services.AddScoped<AccountManager>();
     services.AddScoped<AccountState>();
     services.AddScoped<ShogiSocket>();