Makes sandwiches stop heating themselves up.

Fixes https://github.com/CleverRaven/Cataclysm-DDA/issues/9442.
Fixes price of the RM42 knife.
Merge branch 'sandwich-fix' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into merge
Merge branch 'price-fix' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into merge