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fix the B mass cut in the Bc builder

Vitalii Lisovskyi requested to merge vlisovsk_Bc_fix into 2017-patches

This MR fixes the too-low mass cut used in B meson combiners for B_c->Bmumu decays (StrippingB2OCMuMuBcLine), which removed all the signal.

StrippingReport                                                INFO Event 35000, Good event 35000
 |                                              *Decision name*|*Rate,%*|*Accepted*| *Mult*|*ms/evt*|
 |_StrippingGlobal_                                            |  0.6571|       230|       |  28.903|
 |_StrippingSequenceStreamLeptonic_                            |  0.6571|       230|       |  28.890|
 |!StrippingB2OCMuMuLine                                       |  0.3657|       128|  6.625|  26.715|
 |!StrippingB2OCMuMuSSLine                                     |  0.2029|        71|  2.535|   0.635|
 |!StrippingB2OCMuMuBcLine                                     |  0.0743|        26|  2.038|   0.093|
 |!StrippingB2OCMuMuBcNoPointLine                              |  0.1600|        56|  1.893|   0.247|
 |!StrippingB2OCMuMuLine_TIMING                                |  0.3657|       128|  6.625|   0.044|
 |!StrippingB2OCMuMuSSLine_TIMING                              |  0.2029|        71|  2.535|   0.034|
 |!StrippingB2OCMuMuBcLine_TIMING                              |  0.0743|        26|  2.038|   0.029|
 |!StrippingB2OCMuMuBcNoPointLine_TIMING                       |  0.1600|        56|  1.893|   0.029|

as compared to the past MR !1480 (merged) (see the second table there), the rate increases only slightly for this affected line, while the others are unchanged, as expected.

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