Remove MuonMenuConfig
This file isn't used anywhere and the implied functionality is covered by https://gitlab.cern.ch/atlas/athena/blob/master/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Muon/generateMuon.py
This file isn't used anywhere and the implied functionality is covered by https://gitlab.cern.ch/atlas/athena/blob/master/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Muon/generateMuon.py