tighten cuts in R(D*) hadronic backgrounds

I am tightening the generator cuts for the event types in this request: https://its.cern.ch/jira/browse/LHCBGAUSS-1353

This is due to a considerable mistake in the original request size, documented here: https://indico.cern.ch/event/767391/contributions/3189084/

There is one outstanding issue:

• I can't get the event type right for the decfiles incl_b=Dst,piD0,Kpi,3pi=DecProdGenTightCuts.dec and incl_b=Dst,piD0,Kpi,D,3pi=DecProdGenTightCuts.dec. They should be 2716300X or 2716307X but those are all occupied, with the exception of 27163072 which is retired. I tried 2716308X and 2716309X but these change which signal particle is generated. At the moment I apply a hacky fix with this script when testing.