KeyError introduced by #26

[isehle]

The updated configuration introduced by #26 in config.yaml refers to this as cfg["clusterStudies"]["pileUp"]. This appears to have been correctly changed everywhere else, but this one was missed—easy fix, I'll introduce a PR for it soon.

https://github.com/bfonta/bye_splits/blob/15dcbdb0955969550f301d90d06b5a741c4af0e1/bye_splits/plot/display_clusters/pages/eff_page.py#L27

[bfonta]

I understand this will be fixed by your future PR. Please link a development branch to this PR, so that it is closed as soon as you implement the changes.