Active X plugin: Fix setting a control by task menu.

The property is a QString when set by the menu or a
PropertySheetStringValue when loading the form.

Breakage introduced by
8695c1753964eeb06b5d9306010b56be5fc151c0 .

Task-number: QTBUG-29234

Change-Id: I84c3de80b99c8a20aaf1f8f7289882b0092d6a0a
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
(cherry picked from qttools/3e43b158ce158dc1285593d2c7555351033fc3ce)
BlackBerry: handle window state navigator events

backport of qt5 439002cddeb32766ea9806ac8b5cf9a973ed0f13

Change-Id: I2431ebd1240ba6f3c2b690b311301d222ec10865
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>