Remove unneccesary ProbNN options

Remove settings for default (empty) ProbNN values

• /Hlt/RecoConf/python/RecoConf/protoparticles.py
• /Hlt/Hlt2Conf/python/Hlt2Conf/settings/hlt2_pp_2024.py

these to-be-removed options don't hurt, but are confusing. doesn't affect refs.

needs DaVinci!1105 (merged)

fyi @jonrob