Fix bug in cleaning of jets against electrons

Affected plugins used to read electrons as objects of types trigger::TriggerElectron
or trigger::TriggerCluster. However, they can be stored as trigger::TriggerPhoton
as well [1].

[1] https://hypernews.cern.ch/HyperNews/CMS/get/egamma-hlt/201.html
Merge pull request #4542 from andrey-popov/fixJetElectronCleaning

Fix bug in cleaning of HLT jets against electrons