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Change the single-charm combiners to reduce the rate

Mengzhen Wang requested to merge mwang_reduce_doubleCharm_rate into yajing_double_charm

Close this MR. Yajing will implement the updates locally.

Not good to use single-charm combiners for the cross-section measurement, where the selection is quite loose to enable the analysis of a large pT-y region. Use the other combiner in charm region instead.

Latest rate tested using 100k hlt1 filtered MB sample: below 100Hz for each line.

   LAZY_AND: Hlt2BandQ_DoubleCharmOppositeSignDecisionWithOutput                                               #=100000  Sum=6           Eff=|(0.006000000 +- 0.00244942)%|
   LAZY_AND: Hlt2BandQ_DoubleCharmSameSignDecisionWithOutput                                                   #=100000  Sum=5           Eff=|(0.005000000 +- 0.00223601)%|
Edited by Mengzhen Wang

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