Stickynotes bugfix (#21887)

A handful of bugfixes covering stuff I missed in the original
stickynotes PR.
- Stickynotes can now interact with machinery, such as disposals or the
papershredder.
- - Turns out that after attack still has priority over interacting with
machines. You learn something every PR.
- Crumpled stickynotes can no longer be attached like a normal
stickynote. They can also no longer be written on.
- - As part of this, paper now uses a variable to track if it's
crumpled. Before, it would just check the icon_state.
- Crumpled stickynotes now use the crumpled sprite when being shredded.
Before it was just a normal paper sprite.

code/modules/paperwork/paper_bundle.dm

@@ -36,6 +36,8 @@
 
 /obj/item/paper_bundle/attackby(obj/item/attacking_item, mob/user)
 	..()
+	if (istype(attacking_item, /obj/item/paper/stickynotes/pad))
+		return
 
 	if (istype(attacking_item, /obj/item/paper/carbon))
 		var/obj/item/paper/carbon/C = attacking_item