nat: disable nat44-ei-in2out-output ttl check

nat: disable nat44-ei-in2out-output ttl check

Type: fix

A packet passing through nat44-ei-in2out-output,
has its ttl value validated in earlier nodes.
"ip4-input" node checks ttl for locally generated packets.
"ip4-rewrite" node validates ttl in forwarded packets.

Thus for example, the ED counterpart disables ttl checks
in its "nat44-ed-in2out-output" node.
This patch updates nat44 EI conditions for ttl checks to
those currently used in nat44 ED case, meaning no extra ttl
validation for in2out when output-feature is enabled.

Signed-off-by: Alexander Skorichenko <askorichenko@netgate.com>
Change-Id: Idd15d7c9a746b60c0a6dac5537d00ef10c257fdc
(cherry picked from commit d1ca70c7e11dac7b9fff802ca5f1d9051c984c34)