By TOM SHANAHAN Duke football opened the season with anything but a dink-and-dunk approach to addressing Black Lives Matters and social justice. Teams warming up in T-shirts sends a message, but as a statement it’s basically a dump-off pass. The Blue Devils took the field Saturday at Notre Dame with a powerful running play into the middle of the issue that riles some fans unwilling to accept systemic racism or social injustice. The players’ helmets featured a Black…