R1:d54a8b41496f

Simplify Maniphest button filter toggle things

Summary:
Although these filters work pretty well, you still end up doing a double take
sometimes. Make the behavior simpler and more consistent by adding an "All"
button to "Open / Closed" so all three rows behave the same way (before, the top
row was toggleable but the other rows were select-only-one).

I played around with the styles a little bit too to try to make the selected
state more obvious.

sandra/anjali, let me know if this is good enough once it…