QtIFW

Fix setValue saving in restart

When running maintenancetool and installing a component that sets a value
in installscript with setValue, the value is cleared when pressing
'Restart'.

Task-number:QTIFW-504

Change-Id: Ie588b6f1011d7b50b771ea8ee0dea99350f65878
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Iikka Eklund <iikka.eklund@theqtcompany.com>