data: Add Vorbis aliases as supported mime-types

This shouldn't change much, but my code to generate default applications
(including the default music player and video player) in Fedora is very
naive:
http://pkgs.fedoraproject.org/cgit/shared-mime-info.git/tree/shared-mime-info.spec#n11

This caused 2 lines to appear in the defaults.list:
audio/x-vorbis=org.gnome.Totem.desktop;
audio/x-vorbis+ogg=rhythmbox.desktop;org.gnome.Totem.desktop;

This meant that audio/x-vorbis+ogg showed up as being handled by Totem,
and made gnome-control-center's Details panel think that Totem was the
default music player.

See https://bugzilla.redhat.com/show_bug.cgi?id=1146001

https://bugzilla.gnome.org/show_bug.cgi?id=737655