Andrea Fercia 1f4dab28fe Accessibility: Improve the Theme Details modal accessibility.
- sets the modal content to `role="document"` to make screen readers switch back to browse mode
- standardizes the Themes screen and Customizer modals interaction
- Themes screen modal: sets initial focus on the modal overlay instead of the primary button, avoiding to "skip" content for keyboard and screen reader users

Fixes #42055.

Built from https://develop.svn.wordpress.org/trunk@41658


git-svn-id: http://core.svn.wordpress.org/trunk@41492 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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