fdo#66854 keep shadow distance of non-supported MSO shadow type

this is a slight improvement of d7367b709dc4e97714fb2084b872a96389e768fb
the rendering of star from #i119634# bugdoc was kept
the rendering of the yellow circle shadows from fdo#66854 bugdoc
was improved

Change-Id: Ife53328ef665131fb954eb33c2e8269ad10da0fe
Reviewed-on: https://gerrit.libreoffice.org/6719
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>