Update client/src/legacy/TabSet.js
Update client/src/legacy/TabSet.js

Co-authored-by: Guy Sartorelli <41a963e6c459c7fee31247f36441017348f9a054@users.noreply.github.com>
silverstripe/silverstripe-admin,silverstripe/silverstripe-admin,silverstripe/silverstripe-admin