net/mlx5: HWS, fix missing ip_version handling in definer

Fix missing field handling in definer - outer IP version.

Fixes: 74a778b4 ("net/mlx5: HWS, added definers handling")
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250610151514.1094735-6-mbloch@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>