Adjust CaloCellDFGetter.py: AlgTools used in AODCellProduction are now private

Walter Lamplrequested to merge
wlampl/athena:fixATLASRECTS-5007 into master

Adjust configuration code CaloCellDFGetter.py following !24042 (merged) that made the tools used in the AODCellProduction private.

Fixes ATLASRECTS-5007

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