TOOLS/autoload.lua: update extensions

* duplicated 'ogv' renamed to 'ogm'
* 'ogg' and 'opus' added as common audio file extensions

TOOLS/lua/autoload.lua

@@ -22,7 +22,7 @@ end
 
 EXTENSIONS = Set {
     'mkv', 'avi', 'mp4', 'ogv', 'webm', 'rmvb', 'flv', 'wmv', 'mpeg', 'mpg', 'm4v', '3gp',
-    'mp3', 'wav', 'ogv', 'flac', 'm4a', 'wma',
+    'mp3', 'wav', 'ogm', 'flac', 'm4a', 'wma', 'ogg', 'opus',
 }
 
 mputils = require 'mp.utils'