Fix flags in BPHY25.py
Follow up to !69731 (merged)
SlimmingHelper
should use flags
and not ConfigFlags
as input argument https://gitlab.cern.ch/atlas/athena/-/blob/main/PhysicsAnalysis/DerivationFramework/DerivationFrameworkCore/python/SlimmingHelper.py?ref_type=heads#L79
Updated to use flags
everywhere in the config for consistency with other CA configs
FYI @xchen