fix: TrackStateType printout in wrong order (#2950)

`operator<<(std::ostream& os, ConstTrackStateType t)` prints out the flag bits as a binary number, with bit 0 (`MeasurementFlag`) at the end. This is belied by the label `MPOHMS`, which should be `SMHOPM`.

This PR fixes the label. Another option would be to reverse the order of bit printout. Please comment if you think that would be better.

Core/include/Acts/EventData/TrackStateType.hpp

@@ -115,8 +115,8 @@ class ConstTrackStateType {
     for (std::size_t i = 0; i < TrackStateFlag::NumTrackStateFlags; i++) {
       trunc[i] = bs[i];
     }
-    // MeasurementParameterOutlierHoleMaterialSharedhit
-    os << "MPOHMS=" << trunc;
+    // SharedhitMaterialHoleOutlierParameterMeasurement
+    os << "SMHOPM=" << trunc;
     return os;
   }