Demote warning to debug in InDetTestPixelLayerTool [ATR-25694]
Follow up of !53927 (merged)
The old InDetTestBLayerTool didn't produce any warning when no TrackParameters list was returned by the getPixelLayerParameters function.
https://gitlab.cern.ch/atlas/athena/-/blob/nightly/master/2022-06-04T0501/InnerDetector/InDetRecTools/InDetTestBLayer/src/InDetTestBLayerTool.cxx#L211
The warning message present in InDetTestPixelLayerTool, which replaced the InDetTestBLayerTool, is thus demoted to debug.