Fix being unable to mod non-empty shopping carts.

Changed the vehicle examine logic so that now if you say "No" to taking items from a cargo area, or drinking/filling from a kitchen area, instead of exiting the dialogue you will be taken to the vehicle examine screen.

If you answer "Yes" and take items/water, the examine screen will not be shown (current behavior).

Fixes #2623 as elegantly as it can be without adding another command.