WelcomePage: update of images
Change-Id: I9c2846b5b6df58f7c99a05cf4dc004ceba8c9e63 Reviewed-on: http://codereview.qt-project.org/5707 Reviewed-by:Qt Sanity Bot <qt_sanity_bot@ovi.com> Reviewed-by:
Thomas Hartmann <Thomas.Hartmann@nokia.com>

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