mediathek: Use new default feed
mediathek: Use new default feed

Use "Frag den Lesch" because "Neues aus der Anstalt" does not exist anymore

Signed-off-by: Jens Georg <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@jensge.org>

GNOME/rygel,GNOME/rygel,GNOME/rygel