JetTagging: Add Ntrk to DNN tagger

The code responsible to get the number of tracks for the DNN tagger in the BoostedJetTagger is missing. It was added for the ANN tagger, not for DNN. This merge request is to include the same block that is present in JSSWTopTaggerANN.cxx and add it to JSSWTopTaggerDNN.cxx

requested review from @rles

This merge request affects 1 package:

• Reconstruction/Jet/BoostedJetTaggers

This merge request affects 1 file:

• Reconstruction/Jet/BoostedJetTaggers/Root/JSSWTopTaggerDNN.cxx

Adding @cdelitzs ,@sschramm ,@jveatch ,@goetz ,@meehan ,@rnewhous as watchers

added JetEtmiss Reconstruction analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash 96f24ea3)

	Athena	AnalysisBase	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 7919] (remote access info)

Hi, changes look fine, approved from AR side. Best regards.

added analysis-review-approved label and removed analysis-review-required label

Looks good, approving - L1

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 0ef7507c