Fix for QWinThumbnailToolBar GDI leak

QTBUG-41635

Change-Id: I60e34c8f32df6fc7ff9eac2812f71d611b903f41
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Remove setting of the default identifier from QWinJumpList.

QWinJumpList does not work with a default-generated ID, this is
only useful when the ID is properly registered.

Task-number: QTBUG-41155
Change-Id: Ic0e0238fa3337d79ac7bc3d1efb314e1533355f2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Merge remote-tracking branch 'origin/5.4' into dev

Change-Id: I8759ae656bb387e564f90fbac5dcf8cafc550cff