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Demi Lovato’s first two albums were unexpected triumphs from the Disneyfactory, offering an independent-minded, refreshingly guilt-free take on teen-pop. On “Demi,” the “X Factor” judge sounds like she’s trying to make up for lost time by dumbing down and eradicating whatever personality she can. Her voice, once a Kelly Clarkson blowtorch set to low, is now a Katy Perry arc welder, and she pillages top 40 radio for whatever isn’t nailed down.