Fix Y-scale drawing of THStack
Fix Y-scale drawing of THStack

Always check fMinimum/fMaximum values. Always multiply maximum by 1.05.
Reported: https://root-forum.cern.ch/t//31266
linev/jsroot,bellenot/jsroot,bellenot/jsroot,root-project/jsroot,bellenot/jsroot,root-project/jsroot,linev/jsroot