Hardcode the element name of the Fluendo MP3 decoder when detecting supported mimetypes.
Hardcode the element name of the Fluendo MP3 decoder when detecting
supported mimetypes.

gstreamer--

BUG: 245101

KDE/phonon-xine,KDE/phonon-directshow,KDE/phonon-xine,KDE/phonon-mmf,KDE/phonon-xine,KDE/phonon-gstreamer,KDE/phonon-gstreamer,KDE/phonon-directshow,shadeslayer/phonon-gstreamer,shadeslayer/phonon-gstreamer,shadeslayer/phonon-gstreamer,KDE/phonon-waveout,KDE/phonon-quicktime