consistent spelling of LArElecCalibDBCfg/LArElecCalibDBConfig

Walter Lamplrequested to merge
wlampl/athena:LArElecCalibDbDB into 23.0

The main method in LArElecCalibDBConfig was called LArElecCalibDbCfg. This MR makes the spelling (capitalization) consistent between function name and file name.

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