send all audio streams on hls channels with no preferred language (#142)

* Revert "fix search index threading (#141)"

This reverts commit 3fb6da0754.

* send all audio streams on hls channels with no preferred language

ErsatzTV.Core/Interfaces/Plex/IPlexTelevisionLibraryScanner.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Plex;
 using LanguageExt;
@@ -12,8 +10,6 @@ namespace ErsatzTV.Core.Interfaces.Plex
         Task<Either<BaseError, Unit>> ScanLibrary(
             PlexConnection connection,
             PlexServerAuthToken token,
-            PlexLibrary plexMediaSourceLibrary,
-            Func<List<MediaItem>, ValueTask> addToSearchIndex,
-            Func<List<int>, ValueTask> removeFromSearchIndex);
+            PlexLibrary plexMediaSourceLibrary);
     }
 }