TileRecAlgs: Remove reference to IAtRndmGenSvc.

Remove reference to obsolete/unused IAtRndmGenSvc.

TileCalorimeter/TileRecAlgs/src/TileMuonReceiverReadCnt.cxx

 /*
-  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 //*****************************************************************************
@@ -31,7 +31,6 @@
 // Atlas includes
 #include "StoreGate/ReadHandle.h"
 #include "AthenaKernel/errorcheck.h"
-#include "AthenaKernel/IAtRndmGenSvc.h"
 
 // Gaudi includes
 #include "GaudiKernel/ISvcLocator.h"