ANG-6861: an accordion doesn't open in special condition.

The properties for this action, 'open' and 'active', will make a bug from 'toggleActive' function in moon.ExpandableListItem. When 'disabledChanged' is called by changing 'disabled' property, It only handles 'open' property using 'setOpen' function.

In this PR, the bug is fixed using 'setActive' function in 'disabledChanged' handler.