selftests: netfilter: nft_queue.sh: reduce test file size for debug build

selftests: netfilter: nft_queue.sh: reduce test file size for debug build

The sctp selftest is very slow on debug kernels.

Reported-by: Jakub Kicinski <kuba@kernel.org>
Closes: https://lore.kernel.org/netdev/20240826192500.32efa22c@kernel.org/
Fixes: 4e97d521c2be ("selftests: netfilter: nft_queue.sh: sctp coverage")
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://patch.msgid.link/20240827090023.8917-1-fw@strlen.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>