ts4chi2 cut fix

It turns out that for all the benchmarking plots produced by HCAL and JetMET, 
ts4chi2 parameter (cut) of 15.0 was used, while in the code accepted to 73X 
https://github.com/cms-sw/cmssw/pull/6432/files#diff-6a82963ad6ff7ffb86094dfeb44a72e2R134
it was mistakenly left as 0.