[ardour-dev] small bug with "off" button

[Christophe Combelles]

Hello,

here is a small UI bug :

- On the mixer, click once on the automation "off" button (below solo
and mute).
- a menu appears (off, play, write, touch)
- click anywhere else but on the menu.

=> the button remains pressed and orange  (pressed like an orange? :)

I think it should behave like the INPUT button : orange while mouse
button down, but black again on mouse button release.

regards
Christophe