TrigT1RPClogic+Muon[Cabling,Conditions]: remove LVL1_STANDALONE code
The LVL1_STANDALONE
compilation is no longer needed (confirmed by @mcorradi). This MR removes all #ifdef
'ed code. This will also help to simplify the log messaging implementation in the muon cabling (ATLASRECTS-6313) and related code.
Also delete the unused ICallBackMuonRPC_Cabling.h
.