The great pop battle of 2015 wasn’t really a battle at all, even Justin Bieber knew that. “It’s a friendly competition,” Bieber said in a radio interview shortly after One Direction announced that their fifth studio album, Made in the AM, would arrive on the same day as his redemptive comeback record, Purpose . “I think it was a strategy on their part, ‘cause my release date was first.” Whoever made the call to claim Nov. 13 for One Direction might have assumed that Bieber would flake.  When