gst: fix bayer format detection in arv_pixel_format_from_gst_caps.
gst: fix bayer format detection in arv_pixel_format_from_gst_caps.

AravisProject/aravis,AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,AravisProject/aravis,AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,AravisProject/aravis,AnilRamachandran/aravis