ATLANTA — Senate candidate Jon Ossoff’s closing TV argument is a call to action centered on Black voters’ struggles with injustice and the coronavirus pandemic as he makes his final pitch in the last week of the runoff campaign. The 30-second spot, “We the people,” includes flashbacks to the stories of five Black Georgians his campaign featured in earlier ads, which highlight how the pandemic has disproportionately sickened African-American families and invoke demonstrations demanding racial justice and equality. The ad released Wednesday doesn’t mention Ossoff’s rival, U.S. Sen. David Perdue,…