Fix game freeze when player cannot contain mission reward

[BrettDong]

Summary

Bugfixes "Fix game freeze when player cannot contain mission reward"

Purpose of change

Fix #47282 : The game stuck in an infinite loop trying to add the mission reward item to the player's inventory when the player cannot contain it.

Describe the solution

Swap the order of two statements in item_pocket::handle_liquid_or_spill.

Describe alternatives you've considered

A band-aid fix, see BrettDong@29e4c2b: Add a check can_stash. If the player cannot stash the reward item, then place it on the ground instead. This avoids the infinite loop.

Testing

Load the save in #47282 and the game does not freeze.