Revert "ffmpeg: force 128k default audio bitrate if nothing is specified and there is no specific default"

This reverts commit 628a73f8f3768513fa6152c98d54842cf2ae1aad.

At the time of said commit there was talk of removing the audio bitrate
"ab" option to bring FFmpeg in line with what Libav has done in 2012 in
commit 041cd5a0c55e02dd3b9a2419644b03103819c3d3. By having different
option flags for the "ab" and the ordinay bitrate "b" option is is
possible to have different default bitrates for audio and video. In
order to maintain this behaviour and not break user scripts the commit
to be reverted added code to ffmpeg.c that set the bitrate value to the
audio default for audio codecs, but only if AVCodec.defaults didn't
exist (as in this case the default would be codec-default and not
affected by the "ab" removal).

This had the downside of being an API violation, because
AVCodec.defaults is not a public field. Given that the "ab" option
and its audio-specific default value have never been removed,
said API violation can be simply fixed by reverting said commit.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

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