Make busy indicator durable column aware

Summary: Fixes T7699, moves busy indicator when durable column is present

Test Plan: visit uiexamples busy page, toggle column on and off

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7699

Differential Revision: https://secure.phabricator.com/D12257