Fix display of promote to group label

Closes #62200

See merge request gitlab-org/gitlab-ce!28637

(cherry picked from commit 9c2d0d87)

f9a55f93 Fix display of promote to group label
52764ec5 Apply suggestion to spec/helpers/labels_helper_spec.rb
58dc21e7 Apply suggestion to spec/features/projects/labels/user_promotes_label_spec.rb