Disney on autopilot is still pretty good. And that’s the case with the studio’s latest film, “Raya and the Last Dragon.” 500 years ago, a purple plasmatic plague known as the druun swept over the dragon-shaped nation of Kumandra. Magical dragons defending humans sacrificed themselves. And Sisu (Awkwafina), the last of them, annihilated the druun, and laid to rest for eternity. The nation divided, however, becoming five factions — heart, talon, tail, spine, and fang. Sisu’s light, a glowing orb, is guarded by the Chief of Heart, Benja (Daniel Dae Kim), and his daughter Princess Raya (Kelly Marie Tran).