Stop out of bounds countdown from resetting on new bomb location opening.

A big issue with certain maps, tunnels especially, is that the defenders can push into the attacker's territory 10 seconds before the next site opens up. On small maps, this allows them to get to the bomb before many of the attacker team have even respawned.

My idea is to have the timer continue counting down for players who were in the red zone when the next site opens up; to cancel the countdown, they must return to the previous site's in bound area before being able to continue into the next site as usual.