Decode xAODTriggerTowers from ByteStream for L1Calo phase-1 rerunLVL1
xAODTriggerTowers are required as input to phase-1 L1Calo simulation. When running the simulation on data (aka "rerunLVL1") they need to be decoded from data using the corresponding ByteStream converter. Add the xAODTriggerTowers to the list of objects to decode in the L1Calo BS conversion configuration.
Fixes ATR-23459 (along with !43849 (merged) which touches the same file, but shouldn't conflict)