Remove const_cast from FastSiDigitization package

Susumu Odarequested to merge
oda/athena:master-SCTFasDigi into master

Remove const_cast from FastSiDigitization package by removing const from SCT_detElement_RIO_map, Pixel_detElement_RIO_map and Planar_detElement_RIO_map.

Edited by Susumu Oda

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