Force TS demuxer when using BDA access.

It seems that BDA does not filter out corrupted packets so our demuxer
detection can be fooled by bad reception.

modules/access/bda/bda.c

@@ -399,7 +399,9 @@ static int Open( vlc_object_t *p_this )
         i_ret = dvb_SubmitATSCTuneRequest( p_access );
     }
 
-    if( i_ret != VLC_SUCCESS )
+    if( !i_ret )
+        p_access->psz_demux = strdup( "ts" );
+    else
         msg_Warn( p_access, "DVB_Open: Unsupported Network %s",
                   p_access->psz_access);
     return i_ret;