fix path of 2ns stage constants
requested to merge atlas-tdaq-ph2upgrades/atlas-tdaq-htt/tdaq-htt-offline/athena:user/fpastore/test-master into 21.9
While trying to test the access of eos from CI that is causing failures in !59, I added a fix on the constant files path that was causing a crash of test testLogicalHitsToAlg on the tbed machines, but not on lxplus.