use `!currentUserIsInPool()` if user didn't expand or collapse pool
use `!currentUserIsInPool()` if user didn't expand or collapse pool

Don't update the `poolIsExpanded` state based on the props. Instead, when rendering, look to see if the current user is in the given pool _only_ if the `poolIsExpanded` state wasn't already modified by `handleToggleCollapsed()`.

LearnersGuild/echo,ian-deans/echo,sdweber422/echo