test: fix flaky async-hooks/test-tlswrap

There is a race condition in async-hooks/test-tlswrap. This addresses it
by waiting 5 more ticks if the client has not been destroyed yet.

PR-URL: https://github.com/nodejs/node/pull/15744
Fixes: https://github.com/nodejs/node/issues/14404


Reviewed-By: Refael Ackermann <refack@gmail.com>