Revert last mods in TGListTree and do it in a different way - remove Cocoa...

Revert last mods in TGListTree and do it in a different way - remove Cocoa specific ifdefs from DrawItemName, but also put ytext modification in ifdefs (when it's adjusted using pic sizes).
Still, outline and highlight are painted with full item's height.


git-svn-id: http://root.cern.ch/svn/root/trunk@47075 27541ba8-7e3a-0410-8455-c3a389f83636