This switch allows for maxEcell decorator tool to borrow CellLinks() from nearby Egamma clusters for LRT collection in the case of a Run 2 reprocessing, and accesses the CellLinks() directly for Run 3. See [!52293 (merged)\] and [!52256 (merged)\] for more info.
The change is just to allow the maxEcell decoration tool to run in LLP1 derivation for either a Run2 reprocessing or for Run3 data. Previously, it was only configured to for the Run2 case. The change does not otherwise affect the input or output of running the derivation.