Backspace for A-Stop should take effect in autonomous mode, not just practice

[sciencewhiz]

It seems like backspace for A-Stop should work in autonomous mode, not just in practice mode. I'm worried that someone would get used to backspace during autonomous testing and would then run in auto mode, and press backspace and have it not disable. It seems safer to make backspace act as disabled in autonomous mode.

[TheTripleV]

In practice mode, AStop shouldn't permanently disable. The robot should still go into teleop afterwards automatically.

With this proposed behavior, I think the opposite can happen where someone gets used to using backspace to disable the robot in auto and are surprised that the robot magically enables itself in practice mode.

[sciencewhiz]

The DS has bright orange flashing to remind you it's going to enable.