Set aria-expanded attribute true/false to match drawer visibility

[kirsty-hames]

Subject of the issue

As per adaptlearning/adapt-contrib-core#409, buttons and links that unfold / collapse content on the page are to be coded with aria-expanded attribute (according to success criteria 4.1.2 Name, Role, Value).

Expected behaviour

.nav__pagelevelprogress-btn should have the relevant aria-expanded attribute applied to match drawer visibility.

Actual behaviour

No such attribute exists.

[github-actions]

🎉 This issue has been resolved in version 7.2.0 🎉

The release is available on GitHub release

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