tdf#150888 Scale down PPI if it would result in a tiny image

The reason for the blurry document in tdf#150888 is that the image is
tiny. PPI is 2540 in that image but when using the window bounding box
(96, 81) this results in a very small image that the .odt then scales up
which makes it blurry.

Apart from that, when opening the extracted .wmf in Draw it's also very
small, around 0.04" squared.

Because MM_ANISOTROPICs definition allows for arbritrary scaling, when
an image would be smaller than an inch squared the PPI is scaled down to
either the images width or height. This makes the extracted WMF match
the size of competitor office suites and fix the blur bug without
breaking past tests.

Change-Id: I11eab879848d9308f818708a91fd9eb91fc65200
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141533
Tested-by: Jenkins
Tested-by: Tomaž Vajngerl <quikee@gmail.com>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

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