fix work-ahead limit setting (#1023)

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Fixed
 - Fix removing Jellyfin and Emby libraries that have been deleted from the source media server
+- Fix `Work-Ahead HLS Segmenter Limit` setting to properly limit number of channels that can work-ahead at once
 
 ### Added
 - Add audio stream selector scripts for episodes and movies

ErsatzTV.Application/Streaming/HlsSessionWorker.cs

@@ -351,7 +351,10 @@ public class HlsSessionWorker : IHlsSessionWorker
         }
         finally
         {
-            Interlocked.Decrement(ref _workAheadCount);
+            if (!realtime)
+            {
+                Interlocked.Decrement(ref _workAheadCount);
+            }
         }
 
         return false;