Mvd bugfix: use of an uninitialised array

fix use of an uninitialised array sigmaIn and shiftIn here: https://git.cbm.gsi.de/computing/cbmroot/-/blob/master/reco/detectors/mvd/plugins/tasks/CbmMvdSensorHitfinderTask.cxx?ref_type=heads#L493

The MR should fix the tracker timeout problem in the other MR: !1557 (comment 38110)

reco/detectors/mvd/plugins/tasks/CbmMvdSensorHitfinderTask.cxx

@@ -310,7 +310,8 @@ void CbmMvdSensorHitfinderTask::ComputeCenterOfGravity(CbmMvdCluster* cluster, T
   UInt_t shape  = 0;
   Int_t xIndex0 = 0;
   Int_t yIndex0 = 0;
-  Double_t sigmaIn[3], sigmaOut[3], shiftIn[3], shiftOut[3];
+
+  Double_t sigmaIn[3] = {0., 0., 0.}, sigmaOut[3] = {0., 0., 0.}, shiftIn[3] = {0., 0., 0.}, shiftOut[3] = {0., 0., 0.};
 
   //Double_t GetFrameStartTime(Int_t frameNumber);
   //Double_t GetFrameEndTime(Int_t frameNumber) {return GetFrameStartTime (frameNumber+1);}