made xmas crackers tiny (#72224)

## About The Pull Request
Xmas crackers are now tiny instead of normal sized. This also applies to
the used crackers.
## Why It's Good For The Game
They look tiny
(![image](https://user-images.githubusercontent.com/94711066/209444831-24d914cd-8be4-4cf9-b220-5890e29a8b9b.png))
and this makes them fit into trash bags. People just leave these things
all over the floor and they're annoying to clean up when you can't stuff
them in your trash bag.
## Changelog
🆑
fix: xmas crackers are now tiny instead of normal sized
/🆑

code/modules/events/holiday/xmas.dm

@@ -3,6 +3,7 @@
 	icon = 'icons/obj/holiday/christmas.dmi'
 	icon_state = "cracker"
 	desc = "Directions for use: Requires two people, one to pull each end."
+	w_class = WEIGHT_CLASS_TINY
 	/// The crack state of the toy. If set to TRUE, you can no longer crack it by attacking.
 	var/cracked = FALSE