PixelMonitoring: fix of ATLASRECTS-7195

Closed Iskander Ibragimov requested to merge ibragimo/athena:fix/arects-7195 into master

this MR addresses ATLASRECTS-7195:

  • use plain LB histograms for single modules instead of (expensive) kLive histograms
  • post-processing function adjusted to work with those plain LB histograms

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