Remove a couple unnecessary query_yn calls

* querying Y/N every time the player exits a vehicle
* querying Y/N every time the player tries to use their vehicle storage

Both of these seem to just get in the way.
Querying every vehicle exit leads to player automatically hitting Y every time. Then one day it's moving and they die.
Querying for vehicle storage is only necessary if it's a kitchen unit and can be drunk from.
To work on the vehicle, the player can interact with a non-storage part, or an empty storage part.