Make column show/hide behaviors a little simpler

Summary: Ref T7062. The previous fix caused an extra, unnecessary thread load on mobile. Make this code a bit simpler and fix the unnecessary load.

Test Plan: No more load on mobile.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T7062

Differential Revision: https://secure.phabricator.com/D12196