[test/parameters.json] Set 'fixup' to 'never'

The fixed audio files for Youtube have a size lower that the minimum required.

test/parameters.json

@@ -39,5 +39,6 @@
     "writesubtitles": false,
     "allsubtitles": false,
     "listssubtitles": false,
-    "socket_timeout": 20
+    "socket_timeout": 20,
+    "fixup": "never"
 }