net/mlx5e: Set proper IPsec source port in L4 selector

Fix typo in setup_fte_upper_proto_match() where destination UDP port
was used instead of source port.

Fixes: a7385187

 ("net/mlx5e: IPsec, support upper protocol selector field offload")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/ffc024a4d192113103f392b0502688366ca88c1f.1690803944.git.leonro@nvidia.com


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