test: remove 1s delay after non-blocking socket pair accept
test: remove 1s delay after non-blocking socket pair accept

It was added in cl/201419897 to deflake
socket_ip_tcp_loopback_non_blocking_test_gvisor.
It seems we don't need this hack, because the origin issue isn't
reproducible without this hack.

PiperOrigin-RevId: 305871748

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor