Add a noise to paper stamping (#4748)

# About the pull request

<!-- Remove this text and explain what the purpose of your PR is.

Mention if you have tested your changes. If you changed a map, make sure
you used the mapmerge tool.
If this is an Issue Correction, you can type "Fixes Issue #169420" to
link the PR to the corresponding Issue number #169420.

Remember: something that is self-evident to you might not be to others.
Explain your rationale fully, even if you feel it goes without saying.
-->

Adds a paper stamping noise. Reuses Predalien stomp noise because
frankly it's just very fitting.

# Explain why it's good for the game

Increases Reqs Productivity by 400% thanks to auditive feedback.
Stamping the papers has never felt so satisfying.
# Testing Photographs and Procedure
This PR has been stamped by the System Administrators Cabal.


# Changelog
:cl:
add: Stamping papers now makes a noise.
/:cl:

code/modules/paperwork/paper.dm

@@ -382,9 +382,6 @@
 
 /obj/item/paper/attackby(obj/item/P, mob/user)
 	..()
-	var/clown = 0
-	if(user.mind && (user.job == "Clown"))
-		clown = 1
 
 	if(istype(P, /obj/item/paper) || istype(P, /obj/item/photo))
 		if (istype(P, /obj/item/paper/carbon))
@@ -424,6 +421,7 @@
 			return
 
 		stamps += (stamps=="" ? "<HR>" : "<BR>") + "<i>This paper has been stamped with the [P.name].</i>"
+		playsound(src, 'sound/effects/alien_footstep_medium3.ogg', 20, TRUE, 6)
 
 		var/image/stampoverlay = image('icons/obj/items/paper.dmi')
 		var/x
@@ -439,11 +437,6 @@
 		stampoverlay.pixel_x = x
 		stampoverlay.pixel_y = y
 
-		if(istype(P, /obj/item/tool/stamp/clown))
-			if(!clown)
-				to_chat(user, SPAN_NOTICE("You are totally unable to use the stamp. HONK!"))
-				return
-
 		if(!ico)
 			ico = new
 		ico += "paper_[P.icon_state]"