Fix output file comparisons in test_Digi_tf_mc20a_qballs.sh ART job (ATLASSIM-6570)
Fix for OLDvsFixedRef
and regression
checks in test_Digi_tf_mc20a_qballs.sh
ART job.
Should fix ATLASSIM-6570.
NB This merge request only affects an ART script, so will have no effect on the CI output.