iPhone: claiming a daily challenge now shows its reward card

If you play on iPhone, claiming a daily challenge used to go wrong: you'd hear the win sound, but the reward card never came up, and from there the game quietly stopped answering taps. The reward card is now shown the same way the Bazaar's daily reward already is, so it appears on top of the challenge board as it should.

Claim a challenge and the card shows, a tap closes it, and the menu keeps responding. This one is iPhone-specific — iPad, Android, web and Steam were already fine.