Pickle Jars are now made of glass instead of cardboard and are now non-foldable. (#71172)

## About The Pull Request

This is done by making it impossible to fold a jar. You can not fold the
jar, clicking on the pickle jar will do nothing and you will be stuck
right back where you were before you tried to fold the jar. Because:
what the fuck? Folding a glass jar? Huh?
## Why It's Good For The Game

Fixes #71083.

Come on, _folding_ a jar? What the hell? The jar seems to use the rest
of the fancy_box API, so I think it's fine to just have nulls be valid
in this context.
## Changelog
🆑
fix: You can no longer fold a glass pickle jar into cardboard. It will
also no longer recycle into cardboard as well.
/🆑

code/game/objects/items/storage/fancy.dm

@@ -59,6 +59,8 @@
 	. = ..()
 	if(contents.len)
 		return
+	if(!fold_result)
+		return
 	new fold_result(user.drop_location())
 	balloon_alert(user, "folded")
 	user.put_in_active_hand(fold_result)
@@ -471,6 +473,8 @@
 	spawn_type = /obj/item/food/pickle
 	spawn_count = 5
 	contents_tag = "pickle"
+	fold_result = null
+	custom_materials = list(/datum/material/glass = 2000)
 
 /obj/item/storage/fancy/pickles_jar/Initialize(mapload)
 	. = ..()