Fix a tokenizer issue in a rare edge case
Ref T7689. We may not propgate the viewer down to the controls in some rendering pathways. An example is "Create Task..." on workboard columns.
Instead, move the propagation a little deeper.
Test Plan: "Create Task..." on a workboard column.
Reviewed By: btrahan
Maniphest Tasks: T7689
Differential Revision: https://secure.phabricator.com/D12250