bugfix: deactivation of detectors in digitization

The deactivation in digitization using JSON macro approach was not working since module.first = "" in all cases such that the if statement was never passed to deactivate certain detector systems.

sim/response/base/CbmDigitizationConfig.cxx

@@ -158,7 +158,7 @@ bool CbmDigitizationConfig::SetGeometry(CbmDigitization& obj, const pt::ptree& m
 
   if (modulesToDeactivate)
     for (auto& module : modulesToDeactivate.get())
-      if (module.first != "") obj.Deactivate(stringToECbmModuleId(module.second.get<string>("")));
+      if (module.second.data() != "") obj.Deactivate(stringToECbmModuleId(module.second.data()));
   return true;
 }