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ElectronPhotonSelectorTools: close ROOT file after reading

Frank Winklmeier requested to merge fwinkl/athena:ednn into master

Close the DNN ROOT file after reading to release memory and file cache. For an HLT job where we instantiate multiple ElectronDNNCalculators this reduces the virtual memory consumption by 800 MB(!).

Relates to ATR-23903.

Edited by Frank Winklmeier

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