If you run out of time in absolute mode, timer jumps back up to previous time.

[yangez]

To reproduce:

1. Create a 1 minute game with someone
2. Let your clock run to 55 seconds, then make a move
3. In your next move, let your clock run to 0
4. You will lose on time, but the timer will then show 55 seconds on the display.

[yangez]

Appears to have been introduced by #133.