Philippine President Rodrigo Duterte on Sunday fired vice-president and arch-critic Leni Robredo from her post as overseer of his deadly drugs war, an aide said, just days after calling her a “scatterbrain” not to be trusted with state secrets.Robredo, 54, lasted less than three weeks as head of Duterte’s signature anti-narcotics campaign, which she vowed to reform amid allegations that police were committing crimes against humanity in killing thousands of drug suspects.“The vice-president…