CaloCalibrationHitsTestTool: switched to reading Calo DD manager from the Cond Store
The Calo DD manager can no longer be accessed in the Det Store.
Fixes ATLASSIM-6214
Also made a few cosmetic changes in the code
The Calo DD manager can no longer be accessed in the Det Store.
Fixes ATLASSIM-6214
Also made a few cosmetic changes in the code