Fix MATE dependencies

There's a number of dependencies that are being excluded but are needed by core
MATE components so the arm images fail because of this. Also fix the mp3 support
package as that's now in gstreamer1-plugins-ugly-free

Signed-off-by: Peter Robinson <pbrobinson@fedoraproject.org>

fedora-mate-common.ks

@@ -31,7 +31,7 @@ lightdm-gtk-greeter-settings
 # audio video
 parole
 exaile
-gstreamer1-plugin-mpg123  # mp3 support
+gstreamer1-plugins-ugly-free # mp3 support
 
 # blacklist applications which breaks mate-desktop
 -audacious
@@ -55,13 +55,9 @@ nss-mdns
 -brasero
 -colord
 -fedora-icon-theme
--GConf2
--gnome-bluetooth-libs
 -gnome-icon-theme
 -gnome-icon-theme-symbolic
 -gnome-software
--gnome-themes
--gnome-themes-standard
 -gnome-user-docs
 
 -@mate-applications