Fix configuration of prescaling with new JO

Trigger/TrigSteer/L1Decoder/python/L1DecoderConfig.py

@@ -163,8 +163,9 @@ def L1DecoderCfg(flags):
     decoderAlg.DoCostMonitoring = flags.Trigger.CostMonitoring.doCostMonitoring
     decoderAlg.CostMonitoringChain = flags.Trigger.CostMonitoring.chain
 
-    from TrigConfigSvc.TrigConfigSvcConfig import TrigConfigSvcCfg
+    from TrigConfigSvc.TrigConfigSvcCfg import TrigConfigSvcCfg, HLTPrescaleCondAlgCfg
     acc.merge( TrigConfigSvcCfg( flags ) )
+    acc.merge( HLTPrescaleCondAlgCfg( flags ) )
 
     # Add the algorithm producing the input RoIBResult
     from TrigT1ResultByteStream.TrigT1ResultByteStreamConfig import RoIBResultDecoderCfg, L1TriggerResultMakerCfg

Trigger/TriggerCommon/TriggerJobOpts/python/TriggerConfigFlags.py

@@ -89,8 +89,9 @@ def createTriggerFlags():
     # use or not frontier proxies
     flags.addFlag('Trigger.triggerUseFrontier', False)
 
-    # the configuration name, see TriggerFlags for full info
-    flags.addFlag('Trigger.triggerConfig', 'MCRECO:DEFAULT')
+    # the configuration source
+    # see https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerConfigFlag
+    flags.addFlag('Trigger.triggerConfig', 'FILE')
 
     # name of the trigger menu
     flags.addFlag('Trigger.triggerMenuSetup', 'LS2_v1')