dlls/ws2_32/tests/sock.c: Wait on thread handles before closing sockets

[Jon Griffiths]

> CloseHandle doesn't wait for the thread to finish, so
> this has no effect. In any case there doesn't seem to be any need
> to wait in those tests.

My bad. There was something hokey with the tests, moving the CloseHandle made them pass consistently. After changing the implementation I can't repeat it. I'll resend when I get some time this weekend.

Cheers
Jon