fix the compiler warning in the header

core/base/CbmDigiManager.h

@@ -161,8 +161,8 @@ public:
      ** Temporary solution until the classes are unified.
      **/
   //void UseMuchBeamTimeDigi(Bool_t choice = kTRUE) { fUseMuchBeamTimeDigi = choice; }
-  void UseMuchBeamTimeDigi(Bool_t choice = kTRUE) { fUseMuchBeamTimeDigi = kFALSE; }
-
+  void UseMuchBeamTimeDigi(Bool_t /*choice = kTRUE*/) { fUseMuchBeamTimeDigi = kFALSE; }
+  void UseMuchBeamTimeDigi() { fUseMuchBeamTimeDigi = kFALSE; }
 
 private:
   static std::map<ECbmModuleId, CbmDigiBranchBase*> fBranches;  //!