Vehicles cancelled movement fuel fix

[andrzejfalkowski]

It's possible to empty a vehicle's gas tank by planning and cancelling movement immediately even without unpausing the game. The "never left" check was not applied to vehicle movement groups resulting in fuel being consumed on "arrival" in the same sector. With check applied, fuel will be only consumed if any time elapsed.

STR:

1. Plan a movement with a vehicle to another sector and confirm it.
2. Cancel the planned movement without unpausing the game.
3. Notice that passengers are instantly back in the sector and available for another assignment yet fuel bar is down.
4. This can be repeated infinitely until all fuel is gone.