MuonPRDTest: Add DoTGCDigit option to NSWPRDValAlg

Minlin Wurequested to merge
(removed):add_TGCDigit into master

The DoTGCDigit variable haven't been included in the NSWPRDValAlg.cxx/.h but declared as True in share/NSWPRDValAlg.digi.py.

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