Remove dashes on Tagify autocomplete widget when option "On click" is used

Problem/Motivation

When there is an entity reference field from hierarchical taxonomy term using "On click" option, they are rendered with dashes.

Steps to reproduce

1. Create a hierarchical vocabulary
2. Create an entity reference field referencing the previous vocabulary
3. Enable "On click" option in the Tagify widget
4. Click on the field and see how the dropdown items have been rendered with dashes

Proposed resolution

Remove the dashes from the dropdown items.