[menu-dropdown] state fixes (#2810)
[menu-dropdown] state fixes (#2810)

* fix(menu-dropdown): selection state

The selection state was using the previous props.

* fix(menu-dropdown): navigable state

The navigable state was using the previous props.

Co-authored-by: Gary Gong <ede4c07ec5727c7aaeeed31bb41b8a5a2816815e@users.noreply.github.com>
salesforce/design-system-react,salesforce/design-system-react,salesforce/design-system-react