Revert accidently committed stuff: "simplify TileLoader::scaledLowerLevelTile()"
Revert accidently committed stuff: "simplify TileLoader::scaledLowerLevelTile()"

This reverts commit 172c8c61f2f6c72f376f96871fad3a4a3a72c941.

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