Quick fix for a crash when running athenaHLT with MTCalibPeb.py job options. The crash happens due to a misconfiguration which was uncovered by adding the BeginRun incident in !20762 (merged).
LVL1ConfigSvc has to be initialised before the
L1Decoder algorithm handles the BeginRun incident. In new-style job options this should be ensured by
L1DecoderCfg (cc @tbold). Since MTCalibPeb.py are old-style job options, this MR is just adding the configuration of
LVL1ConfigSvc in the same way as done in TrigUpgradeTest/testHLT_MT.py.