TrackSplittingMonitor: fix bug in the BPix hits counting

[mmusich]

PR description:

Title says it all, put back lines removed in #41528 that were hiding a bug in the track selection. Prompted by comment #41740 (comment)

PR validation:

cmssw compiles

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

Will be (partially) backported in #41739 and #41740

[mmusich]

type bug-fix

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-41769/35635

• This PR adds an extra 16KB to repository

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for master.

It involves the following packages:

• DQM/TrackingMonitor (dqm)

@nothingface0, @emanueleusai, @cmsbuild, @pmandrik, @syuvivida, @tjavaid, @micsucmed, @rvenditti can you please review it and eventually sign? Thanks.
@arossi83, @VourMa, @hdelanno, @sroychow, @JanFSchulte, @VinInn, @fioriNTU, @jandrea, @mtosi, @idebruyn, @mmusich, @threus this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[mmusich]

@cmsbuild, please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-24d8f1/32781/summary.html
COMMIT: f6c18fb
CMSSW: CMSSW_13_2_X_2023-05-24-1100/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/41769/32781/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 5 lines to the logs
• Reco comparison results: 15 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3221591
• DQMHistoTests: Total failures: 9
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3221560
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 207 log files, 159 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[perrotta]

+1

• Let merge this trivial fix in master
• @emanueleusai please have a look, and possibly sign, the PRs to backport in the 13_0 and 13_1 releases, so that they can be included in the datataking release that will be likely built tomorrow

[perrotta]

merge

[emanueleusai]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will be automatically merged.