ElectronPhotonShowerShapeFudgeTool: Update for thread-safety checker const changes.
requested to merge ssnyder/athena:checkerConst.ElectronPhotonShowerShapeFudgeTool-20220217 into master
The thread-safety checker is getting more strict on const checks. Fix resulting warnings.
Add a const version of FudgeShowers that just uses the previously-loader preselection. Make accessor methods const. Change Shifts/Widths from maps to arrays.