selftests: netfilter: Set gc_thresh[123] for gw netns in nft_nat_zones.sh.

Since commit cda2962b6e2b ("neighbour: Namespacify neigh_tables."),
net.ipv[46].neigh.default.gc_thresh[123] are per-netns attributes.

Let's update nft_nat_zones.sh.

Note that the number of neighbour entries does not even reach the
default gc_thresh1 (128) with the default maxclients=100, and the
raised thresholds are only needed for gw netns when maxclients is
manually increased (e.g., 2000 as mentioned in the comment).

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20261013205816.1642597-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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