Fix composedPath() even more

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

In a "no shadow DOM" situation, all the items in the path before the current target won't be in the path, which is wrong.

This is tested by event-composed-path.html in WPT.

dom.bs

@@ -633,7 +633,7 @@ steps:
    <li><p>If <var>path</var>[<var>index</var>]'s <a for=Event/path>root-of-closed-tree</a> is true,
    then increase <var>currentHiddenLevel</var> by 1.
 
-   <li><p>If <var>currentHiddenLevel</var> is less than <var>maxHiddenLevel</var>, then
+   <li><p>If <var>currentHiddenLevel</var> is less than or equal to <var>maxHiddenLevel</var>, then
    <a for=list>prepend</a> <var>path</var>[<var>index</var>]'s <a for=Event/path>item</a> to
    <var>composedPath</var>.
 
@@ -9991,6 +9991,7 @@ Doug Schepers,
 Edgar Chen,
 Elisée Maurer,
 Elliott Sprehn,
+Emilio Cobos Álvarez,
 Eric Bidelman,
 Erik Arvidsson,
 Gary Kacmarcik,