Remove global subtitle configuration (#14957)

MediaBrowser.Common/Providers/SubtitleConfigurationFactory.cs

@@ -1,21 +0,0 @@
-#pragma warning disable CS1591
-
-using System.Collections.Generic;
-using MediaBrowser.Common.Configuration;
-using MediaBrowser.Model.Providers;
-
-namespace MediaBrowser.Common.Providers
-{
-    public class SubtitleConfigurationFactory : IConfigurationFactory
-    {
-        /// <inheritdoc />
-        public IEnumerable<ConfigurationStore> GetConfigurations()
-        {
-            yield return new ConfigurationStore()
-            {
-                Key = "subtitles",
-                ConfigurationType = typeof(SubtitleOptions)
-            };
-        }
-    }
-}