With cleartype disabled, the non-white count is twice less than with
it. This is a first-aid temporary fix until a better fix is made.

Change-Id: Iadff638656d2d35a03cc452b792b0fb5ed138456
Reviewed-on: https://gerrit.libreoffice.org/26981Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>