tests: py: fix inet/ip_tcp.t test

Contrary to the comment and expected output, nft does _not_ eliminate
the redundant `ip protocol` expression from the second test.  Dependency
elimination requires a higher level expression.  `ip saddr` cannot lead
to the elimination of `ip protocol` since they are both L3 expressions.
`tcp dport` cannot because although `ip saddr` and `ip protocol` both
imply that the L3 protocol is `ip`, only protocol matches are stored as
dependencies, so the redundancy is not apparent, and in fact,
`payload_may_dependency_kill` explicitly checks for the combination of
inet, bridge or netdev family, L4 expression and L3 ipv4 or ipv6
dependency and returns false.

Correct the expected output and comment.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Florian Westphal <fw@strlen.de>

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