Adjust selection of IFT Stripping Line

Tightening the selection requirements of the HeMedian line to adjust a previously too high retention rate.

These stripping lines depend on new LoKi functors, in the corresponding MR Phys!956 (merged).

Please find the retention rates and (CommonParticles overhead-free) timings of our lines, calculated on 200k events (TestMyWGfromSettings.py), below.

StrippingReport                                                INFO Event 200000, Good event 200000
 |                                              *Decision name*|*Rate,%*|*Accepted*| *Mult*|*ms/evt*|
 |_StrippingGlobal_                                            |  0.3000|       600|       |  12.737|
 |_StrippingSequenceStreamBhadronCompleteEvent_                |  0.3000|       600|       |  12.716|
 |!StrippingHeNOverflows_Line                                  |  0.0660|       132|  1.076|   0.168|
 |!StrippingHeL2ppppiLine                                      |  0.0700|       140|  1.671|   0.116|
 |!StrippingLb2dpX_piLine                                      |  0.0475|        95|  1.337|   0.043|
 |!StrippingLb2dpX_pipiLine                                    |  0.0425|        85|  1.906|   0.047|
 |!StrippingHeMedian_Line                                      |  0.0635|       127|  1.260|   0.198|
 |!StrippingLb2V0pphhLLLine                                    |  0.0280|        56|  2.500|   0.095|
 |!StrippingLb2V0pphhLLSSLine                                  |  0.0075|        15|  4.133|   0.085|

In the first version of this MR only the prescaling of the HeMedian line was changed.