SUSYTools d0 syst bugfix for muons

Merged William James Fawcett requested to merge wfawcett/athena:SUSYTools_d0Syst_bugfix into 21.2

Using the dec_d0sig for a comparison caused the decorator to not be properly accessed when running with systematics. An accessor should be used anyway, which fixes the problem in this MR.

The logfiles from the ctests can be found here: /afs/

Edited by William James Fawcett

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