Fix Stage-1 L1 HI ETT algorithm

[harmonicoscillator]

Backport of #13048

This PR is low priority, since no HLT paths actually use this algo, but it should be fixed to save someone in the future.

[cmsbuild]

A new Pull Request was created by @richard-cms (R. Alex Barbieri) for CMSSW_7_5_X.

It involves the following packages:

L1Trigger/L1TCalorimeter

@cmsbuild, @mulhearn, @davidlange6 can you please review it and eventually sign? Thanks.
@Martin-Grunewald this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[mulhearn]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10706/console

[mulhearn]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs after it passes the integration tests and once validation in the development release cycle CMSSW_7_6_X is complete. This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[cmsbuild]

+1
Tested at: 59ae76a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13049/10706/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13049/10706/summary.html

[davidlange6]

+1