Two fixes on Ladder

On Other, the Battles tab now shows Challenge and Tournament each with its own days and sittings. A Challenge win and a Tournament loss on one evening used to add up to one record, and they are different games. And when the player you picked has no battles on record yet, or their tag is not found, the player list stays at the top of the page, so you can switch back.

MCP 11.17.0, JSON API 3.3.0 unchanged.