Field validation message relies on unset title

To replicate:

1. Activate Webform Hints module
2. Assign a form with required fields to use Webform Hints
3. Navigate to the form and click Submit with empty required fields

Error message(s): "field is required". (see attachment)
Should be: "[field-title] is required".

Problem: Webform apparently uses the ["#title"] attribute to construct the message, which is currently unset in webform_hints_add_title because the label should no longer appear. Will need to come up with a better solution.