Fix a bad method call signature throwing exceptions in newer Node

Summary:
Ref T13222. See PHI996. Ref T10743. For context, perhaps see T12171.

Node changed some signatures, behaviors, and error handling here in recent versions. As far as I can tell:

• The script.runInNewContext(...) method has never taken a path parameter, and passing the path has always been wrong.
• The script.runInNewContext(...) method started taking an [options] parameter at some point, and validating it, so the bad path parameter now throws.
• vm.createScript(...) is "soft deprecated" but basically fine, and keeping it looks more compatible.

This seems like the smallest and most compatible correct change.

Test Plan: Under Node 10, started Aphlict. Before: fatal error on bad options parameter to runInNewContext() (expected dictionary). After: notification server starts.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13222, T10743

Differential Revision: https://secure.phabricator.com/D19860