Remove RzxLoader service registration

Author: voytas

src/Spectron.Emulation/DependencyInjection/ServiceCollectionExtensions.cs

@@ -31,6 +31,5 @@ public static void AddEmulation(this IServiceCollection services)
         services.AddSingleton<GamepadManager>();
         services.AddSingleton<KeyboardState>();
         services.AddSingleton<CommandManager>();
-        services.AddSingleton<RzxLoader>();
     }
 }