BUGFIX: remove unnecessary class that breaks the tab opening.
BUGFIX: remove unnecessary class that breaks the tab opening.

This class should be applied higher in the hierarchy so it also
includes panels - and it's already there too.

helpfulrobot/i-lateral-silverstripe-siteconfig,silverstripe/silverstripe-cms,dhensby/silverstripe-reports,silverstripe/silverstripe-cms,silverstripe/silverstripe-siteconfig,silverstripe-labs/silverstripe-reports,silverstripe-labs/silverstripe-reports,dhensby/silverstripe-cms,jonom/silverstripe-cms,dhensby/silverstripe-reports,jonom/silverstripe-cms,dhensby/silverstripe-cms,dhensby/silverstripe-cms