Fix decoration type clash for isSplit.

Multiple components apply xAOD decorations named isSplit. Since a single type is registered for each decoration all components must use the same type for identically named decorations. This patch ensures that PixelCluster_v1, PixelPrepDataToxAOD, PixelNtupleMaker use the same type.

InnerDetector/InDetEventCnv/InDetPrepRawDataToxAOD/src/PixelPrepDataToxAOD.cxx

 /*
-  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -301,7 +301,7 @@ StatusCode PixelPrepDataToxAOD::execute()
       AUXDATA(xprd,char,gangedPixel) =  (char)prd->gangedPixel();
       const Trk::ClusterSplitProbabilityContainer::ProbabilityInfo &
          splitProb = splitProbContainer.isValid() ? splitProbContainer->splitProbability(prd) : Trk::ClusterSplitProbabilityContainer::getNoSplitProbability();
-      AUXDATA(xprd,int,isSplit)      =  static_cast<int>(splitProb.isSplit());
+      AUXDATA(xprd,char,isSplit)      =  static_cast<char>(splitProb.isSplit());
       AUXDATA(xprd,float,splitProbability1)  =  splitProb.splitProbability1();
       AUXDATA(xprd,float,splitProbability2)  =  splitProb.splitProbability2();