"Override" bundle variable is not being deleted

Problem/Motivation

Rabbit Hole provides 4 variables for each entity bundle:

• 'rh_{entity_type}_override_{bundle}'
• 'rh_{entity_type}_action_{bundle}'
• 'rh_{entity_type}_redirect_{bundle}'
• 'rh_{entity_type}_redirect_response_{bundle}'

So, once the bundle is removed, all these variables should be deleted and we already have a function responsible for clean-up:

function rabbit_hole_delete_variables($entity_type, $bundle) {
  variable_del('rh_' . $entity_type . '_action_' . $bundle);
  variable_del('rh_' . $entity_type . '_redirect_' . $bundle);
  variable_del('rh_' . $entity_type . '_redirect_response_' . $bundle);
}

Just need to add one more variable: 'rh_{entity_type}_override_{bundle}'