add factor of 2 to StoPipPip decay in HiggsMakeDecay_tool.cc.

[jamiecd]

Needed bc the charged pions comprise two components of the pions' isospin triplet. This change brings the code into agreement with the (correct) description of models as presented in MeVPrtl TN.

MeVPrtl TN is located at SBN-Doc-32019 (https://sbn-docdb.fnal.gov/cgi-bin/sso/ShowDocument?docid=32019).

Description

Please provide a detailed description of the changes this pull request introduces. If available, also link to a docdb link where the issue/change have been presented on/discussed.

• Have you added a label? (bug/enhancement/physics etc.) Yes.
• Have you assigned at least 1 reviewer? Yes.
• Is this PR related to an open issue / project? No.
• Does this PR affect CAF data format? If so, please assign a CAF maintainer as additional reviewer. No.
• Does this PR require merging another PR in a different repository (such as sbnanobj/sbnobj etc.)? If so, please link it in the description. No.
• Are you submitting this PR on behalf of someone else who made the code changes? If so, please mention them in the description. No.

[kjplows]

Matches formula at the end of Sect 4.1.2 of TN-32019. Approved!

[kjplows]

trigger build LArSoft/lar*@LARSOFT_SUITE_v10_12_02

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