fix for fovorite channel switching in gVideo

[Marcus O.C. Metzler <mocm@netcologne.de>]

Hi,
there is a small error inthe latest version of gVideo, that prevents
it from switching the favorite channels added through libdvb.
I forget to check it in. Here is the diff: 

Index: graphs.cc
===================================================================
212,214c212
<                       set_audio_menu(&dvb.chans[k]);
<               else
<                       set_audio_menu(NULL);
---
>                       set_channel_dvb(GTK_WIDGET(gwidget),k);


----------------------------------
Marcus Metzler

mocm@netcologne.de
Tel: 02234 433113
----------------------------------