Fix "array to string" conversion error.

Summary: Fixes T5298. This bug was probably introduced in D9248. It looks like I forgot to update some references to $version.

Test Plan: Ran arc lint --everything in rPHU.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5298

Differential Revision: https://secure.phabricator.com/D9434