eslint: remove dangling eslint symlink

Reapplication of https://github.com/nodejs/node/pull/9299 since the
symlink was re-added in f44969a5.

PR-URL: https://github.com/nodejs/node/pull/10771


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>