Fix CscCalibTool irreproducibility

Merged Tadej Novak requested to merge tadej/athena:cscfix into master

Fix MT irreproducibility in CscCalibTool by properly storing properties as double to avoid float->double casts.

Also remove one unused property.

I also wonder if we might just drop the usage of TF1 in some cases. Not sure what is faster...

/cc @nkoehler @jchapman

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