Fix plots in ClustersResidual tool to account for all MCHits in the Linker

Minor fix in Residual plot and Occupancy plot for the scifi as requested by @jvantilb . Fix ranges of plotting and also looking to all elements in the Linker, not only the most contributing one. (Next SciFI digi release will have no weighting of the MCHits in the Linker, so to do fair comparisons we changed the logic here when we show the Occupancy in the detector).