remove borders around MarbleWidget
remove borders around MarbleWidget

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