Accessibility: Fix select state usage

The selectable/selected states refer to items in a list and similar,
do not interpret them as text selection states.
Without this change NVDA for example announces text edits as selected
which makes no sense and which it doesn't do for native text items.

Change-Id: Ib1d109523bd4cc2b9b40ace8a8c3d7d3a7f9f25c
Reviewed-by: Jan Arve Sæther <jan-arve.saether@digia.com>