[ATR-22865] Dowgrade WARNING to DEBUG in InputMakerForRoI.cxx
This reflects an identical change which was already carried out in Trigger/TrigSteer/ViewAlgs/src/EventViewCreatorAlgorithm.cxx
This reflects an identical change which was already carried out in Trigger/TrigSteer/ViewAlgs/src/EventViewCreatorAlgorithm.cxx