test: remove flaky designation from ls-no-sslv3

This test was marked flaky after failing in CI on arm7-wheezy two months
ago. It has not failed there since. This commit removes the flaky
designation.

Fixes: https://github.com/nodejs/node/issues/2554
PR-URL: https://github.com/nodejs/node/pull/3620


Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>