Update Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

Co-authored-by: Claus Vium <cvium@users.noreply.github.com>

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -137,7 +137,7 @@ namespace Emby.Server.Implementations.AppBase
         /// Manually pre-loads a factory so that it is available pre system initialisation.
         /// </summary>
         /// <typeparam name="T">Class to register.</typeparam>
-        public virtual void RegisterConfiguration<T>()
+        public virtual void RegisterConfiguration<T>() where T : IConfigurationFactory
         {
             if (!typeof(IConfigurationFactory).IsAssignableFrom(typeof(T)))
             {