Fix standalone build of headers

Phys/DecayTreeTupleMC/src/MCTupleToolKinematic.h

 /*****************************************************************************\
-* (c) Copyright 2000-2019 CERN for the benefit of the LHCb Collaboration      *
+* (c) Copyright 2000-2024 CERN for the benefit of the LHCb Collaboration      *
 *                                                                             *
 * This software is distributed under the terms of the GNU General Public      *
 * Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
@@ -53,6 +53,6 @@ private:
   bool m_storeVertexes;         //!< Store the end and origin true vertex information
   bool m_storeStablePropertime; //!< Store the propertime and vertex also for "stable" particles
 
-#include "DecayTreeTupleBase/isStable.h"
+#include "isStable.h"
 };
 #endif // MCTUPLETOOLKINEMATIC_H

Phys/DecayTreeTupleMC/src/MCTupleToolReconstructed.h

 /*****************************************************************************\
-* (c) Copyright 2000-2019 CERN for the benefit of the LHCb Collaboration      *
+* (c) Copyright 2000-2024 CERN for the benefit of the LHCb Collaboration      *
 *                                                                             *
 * This software is distributed under the terms of the GNU General Public      *
 * Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
@@ -57,7 +57,7 @@ public:
 private:
   std::vector<std::pair<const LHCb::ProtoParticle*, double>> getProtos( const LHCb::MCParticle* ) const;
 
-#include "DecayTreeTupleBase/isStable.h"
+#include "isStable.h"
 
 private:
   IMCReconstructible*     m_recible;   ///< Reconstructible tool