Include muon cabling in L1DecoderCfg

Savanna Shawrequested to merge
sshaw/athena:newjo-l1decoder into master

Moving the muon cabling configurations to the L1DecoderCfg since the muon RoI unpacking always needs the cabling to be configured. This should make it possible to run the newJO trigger test without enabling HLT muons.

cc @tbold for info.

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