mopidy: RDEPEND on gst-plugins-ugly-mad insted of gst-ffmpeg
mopidy: RDEPEND on gst-plugins-ugly-mad insted of gst-ffmpeg

The ffmpeg mp3 decoder is not getting loaded, so use the mad decoder instead.

Issue #1.

radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan