[whatwg/dom] Correct undefined variable in add an event listener (PR #1204)

Also add <div algorithm> wrappers to make this problem less likely to reoccur in this section.

Fixes #1203.

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1204

-- Commit Summary --

  * Correct undefined variable in add an event listener

-- File Changes --

    M dom.bs (22)

-- Patch Links --

https://github.com/whatwg/dom/pull/1204.patch
https://github.com/whatwg/dom/pull/1204.diff

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