Fix operator++ for moduleId enum

The operator needs to exclude a gap in the sequence of numbers. Unfortunately this was done wrongly such that adding new entries in the enum were also excluded.

Comparisons of data files before and after the fix showed identical results up to the reco files.

core/data/CbmDefs.cxx

@@ -17,13 +17,13 @@
 // the values 11-15 are reserved for future detectors.
 // The ids of the passive modules are only relevant at run time so they can
 // be shifted easily
-// The opeartor takes care about the non continuous values for the enum
+// The operator takes care about the non continuous values for the enum
 // When it reaches the last detector it automatically continuous with the
 // first passive module
 ECbmModuleId& operator++(ECbmModuleId& e)
 {
   if (e == ECbmModuleId::kLastModule) { throw std::out_of_range("for ECbmModuleId& operator ++ (ECbmModuleId&)"); }
-  else if (e == ECbmModuleId::kT0) {
+  else if (e == ECbmModuleId::kNofSystems) {  // jump over gap between end of detectors and begin of passives
     e = ECbmModuleId::kMagnet;
   }
   else {