This way the 4 quadrant shapes in the center of the SmartArt form a
circle, as width is shrinking.

It's not height growing, as OOXML spec clearly says "ar" always just
shrinks one axis.

(>1 and <1 "ar" is to be handled when they are seen in action in an
actual document.)

Change-Id: I69f2390ee881253151cccc336ecbf1806a1216dc
Reviewed-on: https://gerrit.libreoffice.org/67980Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins