Add missing line for SubProcess unit test diff

[Dr15Jones]

PR description:

This fixes the unit test diff.

See the unit test error error reported in #38728 (comment)

PR validation:

Test now passes.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-38754/31075

• This PR adds an extra 24KB to repository

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for master.

It involves the following packages:

• FWCore/Integration (core)

@cmsbuild, @smuzaffar, @Dr15Jones, @makortel can you please review it and eventually sign? Thanks.
@makortel, @wddgit this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[Dr15Jones]

please test

[perrotta]

@Dr15Jones thank you for the quick fix.
Would you be able to prepare the 12_4_X backport also, in order to have it merged before this evening IB?
(I am currently in train with intermittent internet connection, otherwise I'd do it myself...).
Thank you!

[qliphy]

backport to 12_4_X: #38756

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ee5a49/26266/summary.html
COMMIT: d02fce1
CMSSW: CMSSW_12_5_X_2022-07-15-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/38754/26266/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 10 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 3654053
• DQMHistoTests: Total failures: 19
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3654011
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 49 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 208 log files, 45 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[makortel]

+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 now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1

[makortel]

@Dr15Jones Could you backport this to 12_3_X as well, or amend #38743 with it?