update according to BnoC 12Jan meeting

patch generated by https://gitlab.cern.ch/lhcb/Moore/-/jobs/22850483

A ParticleContainersMerger is not necessary for these lines, and change to ParticleCombiner. Also Bc->hhh lines are added.

Rates and efficiencys of B(c)->hhh can be found below, where the sample for rate is https://gitlab.cern.ch/lhcb-b2oc/b2ocupgrade/-/blob/master/Moore_input_files/minbias_hlt1filt.ldst, 100k events are used and samples for efficiency is the signal sample efficiency:

B->KKK (4.790000 +- 0.213555)%
B->KpiK ( 5.010000 +- 0.218151)%
B->Kpipi ( 4.330000 +- 0.203532)%
B->pipipi ( 4.473234 +- 0.186594)%
B->pppi ( 5.191753 +- 0.229308)%
B->ppK ( 5.136508 +- 0.225835)%

Bc+->KKK ( 2.098865 +- 0.153516)%
Bc+->KpiK ( 1.877273 +- 0.147012)%
Bc+->Kpipi ( 2.021403 +- 0.153460)%
Bc+->pipipi ( 1.903982 +- 0.138271)%
Bc+->ppbarpi ( 1.980546 +- 0.150833)%
Bc+->ppbarK ( 1.910000 +- 0.136877)%

rate(kHz):

B->KKK 0
B->KpiK 0
B->Kpipi0.02 +/- 0.0141
B->pipipi  0.01 +/- 0.009
B->pppi 0.02 +/- 0.0141 
B->ppK 0.01 +/- 0.0099

Bc+->KKK 0
Bc+->KpiK 0
Bc+->Kpipi 0 
Bc+->pipipi 0 
Bc+->pppi 0.02 +/- 0.0141
Bc+->ppK 0.01 +/- 0.0099