Update mc.MGPy8EG_A14NNPDF23LO_ttbarjets_FxFx_pTbias.py
Storing PDFs and scale variations at ME-level, and changing the PDF use in the PS, moving back to NNPDF23_LO_as_0127
Storing PDFs and scale variations at ME-level, and changing the PDF use in the PS, moving back to NNPDF23_LO_as_0127