During password resets, the 'Generate Password" button has a `aria-expanded="true"` attribute, but the button itself does not expand or collapse anything. This change adds a `skip-aria-expanded` class to the button which is referenced in JavaScript to skip updating the `aria-expanded` attribute on the button itself when clicked.
This change also resets the `aria-expanded` attribute to `false` for the parent form after it's submitted.
Props alexstine, johnjamesjacoby, sabernhardt.
Fixes#54538.
Built from https://develop.svn.wordpress.org/trunk@52450
git-svn-id: http://core.svn.wordpress.org/trunk@52042 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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