fate: try to fix >8bit dpx reg test

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

tests/lavf-regression.sh

@@ -222,8 +222,8 @@ fi
 
 if [ -n "$do_dpx" ] ; then
 do_image_formats dpx
-do_image_formats dpx "-pix_fmt rgb48"
-do_image_formats dpx "-pix_fmt rgb48 -bits_per_raw_sample 10"
+do_image_formats dpx "-pix_fmt rgb48le"
+do_image_formats dpx "-pix_fmt rgb48le -bits_per_raw_sample 10"
 fi
 
 if [ -n "$do_xwd" ] ; then