Fix system view ship crash

Remove the delay in updating the ship contacts list.
It's cheap to do and if they get out of sync then it can crash.

To repro' the original crash just open the system view (F2 then F6) and accelerate time as fast as possible for a while. The game will crash because one of the ships will leave the system but the contacts list won't be updated so it will try and access a deleted ship object.