icon generator: adjust to new conditions in trunk due to autoload, re #2881

git-svn-id: svn://develop.studip.de/studip/trunk@25635 c5b85792-5220-0410-ad23-ed5b6b8ad999
icon generator: fix handling of small dimensions, re #2881

git-svn-id: svn://develop.studip.de/studip/trunk@25636 c5b85792-5220-0410-ad23-ed5b6b8ad999
refs #2878 : smaller X instead of check

git-svn-id: svn://develop.studip.de/studip/trunk@25637 c5b85792-5220-0410-ad23-ed5b6b8ad999