Get rid of another const_cast
Get rid of another const_cast

svn path=/trunk/KDE/kdeedu/marble/; revision=870082

probonopd/marble,Earthwings/marble,utkuaydin/marble,Earthwings/marble,quannt24/marble,oberluz/marble,utkuaydin/marble,probonopd/marble,probonopd/marble,AndreiDuma/marble,probonopd/marble,oberluz/marble,oberluz/marble,Earthwings/marble,tucnak/marble,quannt24/marble,AndreiDuma/marble,tzapzoor/marble,David-Gil/marble-dev,adraghici/marble,tzapzoor/marble,Earthwings/marble,probonopd/marble,adraghici/marble,David-Gil/marble-dev,rku/marble,rku/marble,David-Gil/marble-dev,probonopd/marble,tzapzoor/marble,quannt24/marble,oberluz/marble,AndreiDuma/marble,probonopd/marble,quannt24/marble,rku/marble,AndreiDuma/marble,David-Gil/marble-dev,quannt24/marble,rku/marble,tzapzoor/marble,tucnak/marble,Earthwings/marble,oberluz/marble,tucnak/marble,adraghici/marble,adraghici/marble,quannt24/marble,oberluz/marble,David-Gil/marble-dev,adraghici/marble,tucnak/marble,tzapzoor/marble,Earthwings/marble,utkuaydin/marble,quannt24/marble,AndreiDuma/marble,tucnak/marble,rku/marble,utkuaydin/marble,rku/marble,tucnak/marble,AndreiDuma/marble,tzapzoor/marble,David-Gil/marble-dev,tzapzoor/marble,adraghici/marble,utkuaydin/marble,tucnak/marble,utkuaydin/marble,tzapzoor/marble