Fix double counting of B0 modes with charmonia+K0

It was discovered that few B0 modes with charmonia together with K0 were in the table twice, once as K0 and another time as K_0S/K_0L. Here we fix the issue. This corresponds to https://phab.hepforge.org/D83 with only difference that balancing changes are slightly different given that LHCb DECAY.DEC differs in small details from EvtGen one.