Disabled items shouldn't also be marked as unactionable.

Something can be clickable and disabled. Returning early here prevents that state to be reflected in ListView items.
The reported bug was happening because the items were disabled, but they weren't being reported as clickable.
Talkback doesn't read "disabled" for disabled items unless they are also actionable in certain ways.
Test: CTSAccessibility*, CTS AbsListViewTest, CTS ListViewTest, tried UI with sample app.
Fix: 131281972

Change-Id: Ic9b8c995398151f084d194e272ce082ec345e517