make sure <allowReflexAngle> property isn't saved for lists unnecessarily

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27647 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3538 fixed.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27648 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e