fix caps to avoid videoconvert bug in 1.8 which corrupts data

Previous way of creating caps left invalid colorimetry field 0:0:0:0,
which combined with a bug present in GStreamer 1.8 led to GRAY16_LE data
being corrupted when converted to GRAY16_BE (or vice versa). Current
method will properly initialize colorimetry field, avoiding this problem
in 1.8.

sys/matrox/gstmatroxsrc.c

@@ -544,7 +544,6 @@ gst_matroxsrc_start (GstBaseSrc * bsrc)
 
   /* note that we abuse formats with Bayer */
   gst_video_info_set_format (&vinfo, src->video_format, width, height);
-  vinfo.finfo = gst_video_format_get_info (src->video_format);
 
   if (!src->caps) {
     src->caps = gst_video_info_to_caps (&vinfo);