AcceptL1TopoMonitor: move monitoring code from hltBeginRun to hltStart

beginRun is deprecated and since this monitoring code is not run number
dependent, start() is the right place.

Trigger/TrigAlgorithms/TrigGenericAlgs/src/AcceptL1TopoMonitor.cxx

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "AcceptL1TopoMonitor.h"
@@ -317,7 +317,7 @@ bool AcceptL1TopoMonitor::bookAndRegisterHist(ServiceHandle<ITHistSvc>& rootHist
     return true;
 }
 //----------------------------------------------------------
-HLT::ErrorCode AcceptL1TopoMonitor::hltBeginRun()
+HLT::ErrorCode AcceptL1TopoMonitor::hltStart()
 {
     ATH_MSG_INFO ("beginRun");
     ServiceHandle<ITHistSvc> rootHistSvc("THistSvc", name());

Trigger/TrigAlgorithms/TrigGenericAlgs/src/AcceptL1TopoMonitor.h

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef TRIGGENERICALGS_ACCEPTL1TOPOMONITOR_H
@@ -66,7 +66,7 @@ public:
     HLT::ErrorCode hltInitialize();
     HLT::ErrorCode hltExecute(std::vector<HLT::TEVec>&, unsigned int outputTeType);
     HLT::ErrorCode hltFinalize();
-    HLT::ErrorCode hltBeginRun();
+    HLT::ErrorCode hltStart();
     HLT::ErrorCode hltStop();
 private:
     static const unsigned int m_nTopoCTPOutputs = 128; //! Number of CTP outputs, used for histogram ranges and loops