[Suggestion] Add region restricted filter

They've already added a search parameter for this, so it should be easy to implement.https://www.steamgifts.com/giveaways/search?region_restricted=true

For the time being I'm using it as a bookmark, but it would be very convenient as a dedicated button.

Updated in 1.31

Ah, sorry for the late reply! Apparently GreasyFork doesn't notify you in email by default.
Anyway, thanks for updating your script! (=^-ω-^=)