QtIFW

Set force restart if we _have_ written a new installer base.

Change-Id: I6b59adcc053f33092cc65c16b7fb82c08d221f9d
Reviewed-on: http://codereview.qt-project.org/5853
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@nokia.com>