“The day I die, the day I die/ Where will we be?” So croons Matt Berninger, in that trademark grumble, in “Day I Die” on The National’s seventh LP. Few rock bands could convert a lyric that bleak into a cathartic fist-pump, but that’s the band’s true expertise, and Sleep Well Beast delivers the indie-rock quintet’s usual quota. But as “quota” suggests, there’s also a…