Fix a TrackerDTCProducer input tag in SLHCUpgradeSimulations/Geometry unit test

[silviodonato]

This is a trivial way to solve #29474.
I would prefer the L1T experts fix L1Trigger/TrackerDTC/src/Settings.cc to avoid this kind of error.
Please note that special InputTag such as @currentProcess does not work because of Settings::checkConfiguration() in L1Trigger/TrackerDTC/src/Settings.cc

PR validation:

cmsRun SLHCUpgradeSimulations/Geometry/test/phase2_digi_reco_pixelntuple_cfg.py

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-29476/14680

• This PR adds an extra 12KB to repository

• There are other open Pull requests which might conflict with changes you have proposed:

  • File SLHCUpgradeSimulations/Geometry/test/phase2_digi_reco_pixelntuple_cfg.py modified in PR(s): Squash all Patatrack developments on top of CMSSW_11_3_0_pre5 #27983

[cmsbuild]

A new Pull Request was created by @silviodonato (Silvio Donato) for master.

It involves the following packages:

SLHCUpgradeSimulations/Geometry

@civanch, @Dr15Jones, @makortel, @cvuosalo, @ianna, @mdhildreth, @cmsbuild, @kpedro88 can you please review it and eventually sign? Thanks.
@silviodonato, @dpiparo you are the release manager for this.

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[silviodonato]

another PR will arrive from @tschuh see #29474