selftests/net: packetdrill: unflake tcp_user_timeout_user-timeout-probe.pkt

selftests/net: packetdrill: unflake tcp_user_timeout_user-timeout-probe.pkt

This test fails the first time I am running it after a fresh virtme-ng boot.

tcp_user_timeout_user-timeout-probe.pkt:33: runtime error in write call: Expected result -1 but got 24 with errno 2 (No such file or directory)

Tweaks the timings a bit, to reduce flakiness.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Soham Chakradeo <sohamch@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Tested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20251014171907.3554413-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>