Related to tdf#105277, check that scaling a bitmap with different
scale methods and different bitmap sizes produces (roughly)
the expected results.

Change-Id: Iea9be675b7cc4b0fbbc634501d32ded82bccbb17
Reviewed-on: https://gerrit.libreoffice.org/70775
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>