Reduce PT truth cut overall, reduce PT Offline for minbias tests

The Truth particle selection had a generic 3 TeV selection, which was somehow inconsistent with the 1 GeV offline cut, so this has been reduced to 1 GeV for the trith also.

Similarly, the ID Trigger minbias has a limit of ~400 MeV, and the truth selection was reduced to this, but the offline selection was still set to 1 GeV, so this reduces the minbias offline selection to 400 MeV tracking also