telx: ignore initial page 100

If the TS demux signals initial page 100, then this inital page is likely NOT the subtitle page. Since we can only really handle subtitles, let the teletext decoder figure out which pages are subtitles on its own.

Per request of Marian Durkovic
(cherry picked from commit 1bc06496)

modules/codec/telx.c

@@ -195,7 +195,8 @@ static int Open( vlc_object_t *p_this )
     var_Create( p_dec, "telx-override-page",
                 VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
     var_Get( p_dec, "telx-override-page", &val );
-    if( val.i_int == -1 && p_dec->fmt_in.subs.dvb.i_id != -1 )
+    if( val.i_int == -1 && p_dec->fmt_in.subs.dvb.i_id != -1 
+          && p_dec->fmt_in.subs.dvb.i_id != (1<<16) ) /* ignore if TS demux wants page 100 (unlikely to be sub) */
     {
         p_sys->i_wanted_magazine = p_dec->fmt_in.subs.dvb.i_id >> 16;
         if( p_sys->i_wanted_magazine == 0 )