fate: fix dpx on big endian

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

tests/lavf-regression.sh

@@ -247,7 +247,7 @@ fi
 if [ -n "$do_dpx" ] ; then
 do_image_formats dpx
 do_image_formats dpx "-pix_fmt gbrp10le" "-pix_fmt gbrp10le"
-do_image_formats dpx "-pix_fmt gbrp12le"
+do_image_formats dpx "-pix_fmt gbrp12le" "-pix_fmt gbrp12le"
 do_image_formats dpx "-pix_fmt rgb48le"
 do_image_formats dpx "-pix_fmt rgb48le -bits_per_raw_sample 10" "-pix_fmt rgb48le"
 do_image_formats dpx "-pix_fmt rgba64le"