Add: --format-sort --prefer-free-formats instead of --audio-format

Turns out --audio-format is related to the -x flag which converts
media after it has been downloaded.

Instead, prefer using the FORMAT SELECTION features of youtube-dl to
set the preferred media types when downloading. The specific change is
tied primarily to sites that may offer multiple audio format downloads
and will prefer free formats over others. This is to work around the
issue where HTML5 media containers can not play (all?) m4a tracks
because of the non-free format being unsupported (in firefox at least).

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