[Run2_2017] Remove a section of unneeded code

Merged Alexx Perloff requested to merge github/fork/aperloff/Run2_2017_CleanupBranches into Run2_2017

Created by: aperloff

This PR removes a section of unneeded code from the semivisible jets customization. It was used for the jets_lean branch, which was removed in a different PR. This change has been unit tested.

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