Replace ytdlp config argument for format selection

Using --format-sort is more flexible than using --format

Author: glubsy

config/ytdlp_config.json

@@ -3,8 +3,10 @@
     // For example "134+140/mp4+m4a/bestvideo+bestaudio"
     // would prefer 360p video + AAC 128kpbs audio to be muxed with ffmpeg, 
     // otherwise fallback to "best" according to yt-dlp's logic
-    "format": "mp4+m4a/bestvideo+bestaudio",
-    
+    //"format": "mp4+m4a/bestvideo+bestaudio",
+    // Alternatively, using format sort should be more flexible: 
+    "format_sort": ["res:480","+codec:h264:m4a"],
+
     // Path to your cookies (this value is replaced by the value 
     // submitted via the --cookies parameter to livestream_saver)
     // "cookiefile": "",