HTML cleaner generates invalid close tags for embed, keygen, source, track and wbr

Steps to reproduce:

Use any of the elements embed, keygen, source, track or wbr in an HTML macro with cleaning enabled.

Expected result:

The generated HTML doesn't contain any closing tag for these elements.

Actual result:

The generated HTML contains closing tags for these elements. This is because the list of elements for which the closing tag must be omitted is incomplete.