test: unmark test-process-argv-0.js as flaky
test: unmark test-process-argv-0.js as flaky

https://github.com/nodejs/node/pull/2541 fixed flakiness
in test-process-argv-0.js. However, it was not removed
from the list of flaky tests. This removes it from the
list of flaky tests.

PR-URL: https://github.com/nodejs/node/pull/2613
Reviewed-By: cjihrig - Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node