Add a missing comma in InDetPhysValMonitoringToolCfg.

Karol Krizkarequested to merge
kkrizka/athena:kk_idpvmmissingcomma into 22.0

There was a failure when running IDPVM over data due to TruthPileupEvents being noneNone`. It is because it wasn't correctly set to blank due to a missing comma.

Tagging @goblirsc for comments from IDPVM side.

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