We don't need to scale images for HiDPI mode anymore - this is now
done automatically when the image is loaded.

Change-Id: Ie285cf4d672f4c098a468d3f7560ee2700365b92
Reviewed-on: https://gerrit.libreoffice.org/30340Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>