Unique Fax Sounds (#5430)

# About the pull request

Adds a unique fax sound to the admin/ghost fax announce sound.

# Explain why it's good for the game

Being able to tell what happened by sound is a good thing. Replaces the
generic morse code SOS with an actual fax machine printing off a fax.


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
soundadd: added unique fax sound for fax announcements.
/:cl:

code/game/machinery/fax_machine.dm

@@ -365,7 +365,7 @@ GLOBAL_LIST_EMPTY(alldepartments)
 				to_chat(C, msg_admin)
 			else
 				to_chat(C, msg_ghost)
-			C << 'sound/effects/sos-morse-code.ogg'
+			C << 'sound/effects/incoming-fax.ogg'
 	if(msg_ghost)
 		for(var/i in GLOB.observer_list)
 			var/mob/dead/observer/g = i
@@ -376,7 +376,7 @@ GLOBAL_LIST_EMPTY(alldepartments)
 				if((R_ADMIN|R_MOD) & C.admin_holder.rights) //staff don't need to see the fax twice
 					continue
 			to_chat(C, msg_ghost)
-			C << 'sound/effects/sos-morse-code.ogg'
+			C << 'sound/effects/incoming-fax.ogg'
 
 
 /obj/structure/machinery/faxmachine/proc/send_fax(datum/fax/faxcontents)