TriggerConfig.py: Fix sequences for the offlineWriteBS option

Fix the ByteStream writing in offline athena Trigger jobs by ensuring HLTResultMTMakerAlg and TrigDecMakerMT are placed in the AthOutSeq sequence together with BSOutputStreamAlg which consumes their outputs. They need to run after HLTFinalizeSeq which produces their implicit inputs and this placement ensures this.

Fixes ATR-23447