AnalysisTop: Update config files to use new central PRW files

Merged Oliver Majersky requested to merge omajersk/athena:AT-update-PRW-default-paths into 21.2

This updates the example AnalysisTop tutorial config file to read new location in cvmfs for pileup reweighting files, used by the top phys group.

Edited by Oliver Majersky

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