Added upper bound for decreasing timer

When the timer is increasing, and the countdown from 10 to 0 is going, the timer stays at 0:00 until the game starts. But for example in a 15 minutes match, the decreasing timer starts from 15:10, which seems a bit dirty to me. The cleanest form would be for the timer to stay at 15:00 until the match starts.

The timer already has a lower bound (0), so I just added a higher bound (timelimit). This way it's consistent.