MuonByteStreamCnvTest+MuonCSC_CnvTools+MuonIdCnv+MuonCondInterface+MuonCondSvc: Remove reference to StoreGate.h.

Merged Scott Snyder requested to merge ssnyder/athena:sg.MuonByteStreamCnvTest-20201015 into master

Remove reference to obsolete header StoreGate.h.

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