B2OC: tune rates of B2Dhh lines

Tune rates of the following lines. The rates are calculated from the retentions from running over 100k HLT1-filtered minbias events, as 1140 * N_retained / 100k. The first rate is that obtained from the current b2oc_upgrade branch (plus a commit moving all of these lines back into HLT2), while the second is that obtained after the changes in this MR. Since 1 retained event corresponds to 11 Hz there is some uncertainty on the numbers, but we hope that these are now in the right ball park to be kept for HLT2.

• Hlt2B2OC_BdToD0KK_D0ToHH = 0.068 kHz -> 0.068 kHz
• Hlt2B2OC_BdToD0KPi_D0ToHH = 0.114 kHz -> 0.068 kHz
• Hlt2B2OC_BdToD0PbarP_D0ToHH = 0.171 kHz -> 0.068 kHz
• Hlt2B2OC_BdToD0PiPi_D0ToHH = 0.091 kHz -> 0.057 kHz
• Hlt2B2OC_BuToDmKK_DmToHHH = 0.057 kHz -> 0.011 kHz
• Hlt2B2OC_BuToDmKPi_DmToHHH = 0.239 kHz -> 0.046 kHz
• Hlt2B2OC_BuToDmPiPi_DmToHHH = 0.148 kHz -> 0.023 kHz
• Hlt2B2OC_BuToDpKK_DpToHHH = 0.148 kHz -> 0.034 kHz
• Hlt2B2OC_BuToDpKPi_DpToHHH = 0.262 kHz -> 0.103 kHz
• Hlt2B2OC_BuToDpPbarP_DpToHHH = 0.125 kHz -> 0.000 kHz
• Hlt2B2OC_BuToDpPiPi_DpToHHH = 0.217 kHz -> 0.011 kHz
• Hlt2B2OC_BuToDsmKK_DsmToHHH = 0.057 kHz -> 0.011 kHz
• Hlt2B2OC_BuToDsmKPi_DsmToHHH = 0.148 kHz -> 0.023 kHz
• Hlt2B2OC_BuToDsmPiPi_DsmToHHH = 0.148 kHz -> 0.046 kHz
• Hlt2B2OC_BuToDspKK_DspToHHH = 0.080 kHz -> 0.023 kHz
• Hlt2B2OC_BuToDspKPi_DspToHHH = 0.205 kHz -> 0.080 kHz
• Hlt2B2OC_BuToDspPbarP_DspToHHH = 0.125 kHz -> 0.011 kHz
• Hlt2B2OC_BuToDspPiPi_DspToHHH = 0.262 kHz -> 0.046 kHz
• Hlt2B2OC_BuToDstmKK_DstmToD0Pi_D0ToHH = 0.103 kHz -> 0.034 kHz
• Hlt2B2OC_BuToDstmKPi_DstmToD0Pi_D0ToHH = 0.125 kHz -> 0.046 kHz
• Hlt2B2OC_BuToDstmPiPi_DstmToD0Pi_D0ToHH = 0.080 kHz -> 0.034 kHz
• Hlt2B2OC_BuToDstpKK_DstpToD0Pi_D0ToHH = 0.103 kHz -> 0.023 kHz
• Hlt2B2OC_BuToDstpKPi_DstpToD0Pi_D0ToHH = 0.228 kHz -> 0.080 kHz
• Hlt2B2OC_BuToDstpPbarP_DstpToD0Pi_D0ToHH = 0.171 kHz -> 0.068 kHz
• Hlt2B2OC_BuToDstpPiPi_DstpToD0Pi_D0ToHH = 0.182 kHz -> 0.080 kHz

cc: @mwhitehe