[CR] Buff stabbing skill's ability to reduce stuck chance

Currently, stabbing skill is pretty much completely inferior to cutting it seems. I figure making it better to reduce the chance of getting your weapon stuck would at least make stabbing weapons somewhat more viable.

This is basically a proposal to discuss, but it was easy enough to make a pull request, so I did. The x2 multiplier seems reasonable to me (it basically makes them comparable to cutting, but based on skill), but let me know what you think.