Revert "AUI-1196 Change `expanded` attribute to write once"
Revert "AUI-1196 Change `expanded` attribute to write once"

This reverts commit d556e02b3b6e6e99b4514e7e92e2ca05c751a54b.

dsanz/alloy-ui,dsanz/alloy-ui,dsanz/alloy-ui,dsanz/alloy-ui