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/Metadata/IMusicVideoFolderScanner.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using LanguageExt;
@@ -13,8 +12,6 @@ namespace ErsatzTV.Core.Interfaces.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax,
-            Func<List<MediaItem>, ValueTask> addToSearchIndex,
-            Func<List<int>, ValueTask> removeFromSearchIndex);
+            decimal progressMax);
     }
 }