revert delft as default sequence labelling
revert delft as default sequence labelling


Former-commit-id: 5e3a81c619f8b56ef185a73cd61c62c643ca2cdb
kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid,kermitt2/grobid