Code cleanup of SCTCalib (ATLASRECTS-4575)

Susumu Odarequested to merge
oda/athena:master-ATLASRECTS-4575-SCTCalib-v3 into master

Code cleanup of SCTCalib

  • Remove unnecessary variables
  • Remove undefined methods
  • Add const to some methods

https://its.cern.ch/jira/browse/ATLASRECTS-4575

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