QtIFW

Extend fd8711f9c463c7f4023c6d37592c409f2cf80460.

We need to make sure all updates are not checkable. There
was still the possibility to force a full install while
using the updater ui "Select All" - "Deslect All" buttons.

Change-Id: I47a50c4a29cdefaa7f53b3af35d6eaf08edad400
Reviewed-on: http://codereview.qt-project.org/5635
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Niels Weber <niels.2.weber@nokia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@nokia.com>