Fix bug in EvtBsMuMuKK model
MR for Jira Task: LHCBGAUSS-2132
This bug fix implies a change of Sim09 letter as all event types using this model will be different.
MR for Jira Task: LHCBGAUSS-2132
This bug fix implies a change of Sim09 letter as all event types using this model will be different.