Simplify WJetsNLO processor

[cmantill]

Tested with:

 python run.py --year 2018 --processor vjetsnlo --pfnano v2_2 --no-inference --systematics --no-getLPweights --no-uselooselep --n 2 --starti 0 --sample WJetsToLNu_1J --config samples_inclusive.yaml --key vjetsnlo --channels mu

Let's run only one channel, one year (2018):

python condor/submit.py --year 2018 --tag 25Mar12WJets --config samples_inclusive.yaml --key vjetsnlo --pfnano v2_2 --channels mu --no-inference --processor vjetsnlo --systematics