net/sched: act_ct: Fix adding udp port mangle operation

Need to use the udp header type and not tcp.

Fixes: 9c26ba9b ("net/sched: act_ct: Instantiate flow table entry actions")
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Paul Blakey <paulb@nvidia.com>
Link: https://lore.kernel.org/r/20201019090244.3015186-1-roid@nvidia.com


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