Don't call PixelToLogic twice. Thanks Ashod for noticing.

Change-Id: Id280dad7e310ceaf8678f900e6e70214848dd925
Reviewed-on: https://gerrit.libreoffice.org/51529Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: pranavk <pranavk@collabora.co.uk>