Fix lightbox escape-button bug
Fix lightbox escape-button bug

If a user opened several lightboxes on the same page, closing with
x-link and the last with escape-button, escape-event fired for every
opened lightbox resulting in more history-back than it should.

kaufmo/koala-framework,kaufmo/koala-framework,koala-framework/koala-framework,koala-framework/koala-framework,kaufmo/koala-framework