[whatwg/dom] Fix a small but important error in composedPath() (#727)

The comparison needs to be 'less than or equal', otherwise you don't prepend the items from the same level as the target.

Trivially, in a 'no shadow DOM' situation, all the items in the path before the current target wouldn't be in the path without this patch, which is wrong.

This is tested already by event-composed-path.html in WPT.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/727

-- Commit Summary --

  * Fix composedPath() implementation.

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/727.patch
https://github.com/whatwg/dom/pull/727.diff

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