[skip modfiles] Fixing the Generator's name in EW VBS JO
Description of bug
The generators' names set in the JO 900118..900121 were incorrect as spotted during the production: ATLMCPROD-8891
Changes introduced
evgenConfig.generators = ["VBFNLO", "Py8", "EG"] -> evgenConfig.generators = ["VBFNLO", "Pythia8", "EvtGen"]