Fix case where checked bundles in sidebar don't update #317
The relevant piece of state here is derived from props, and was failing to update upon prop update in the particular case noted in #316.
One thought re: preventing this class of bug in future is to centralize the state management logic that handles whether all bundles are showing, putting it in the shared MobX store (and eliminating use of state derived from props). I might have time to explore this in a separate PR, but I think this quick fix is probably better for now.
Notes re: manual testing