Improved alignment of product name with the motif, cleaned Windows installer image

Change-Id: I13b658b989f639cc444ba59834afad397170478e
Reviewed-on: https://gerrit.libreoffice.org/39861Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Heiko Tietze <tietze.heiko@googlemail.com>