Fixes Icon for the Station Crash Effect (tgstation#67994)

Hey there,

Apparently when balloons were split out of `items_and_weapons.dmi`, this was left behind causing stuff like this to happen:

Pretty goofy, right? Let's update the DMI pathing to ensure we don't see the silly purple/white cube when we really want to see an effect that nearly no one knows of (it's the thing that helps you crash the shuttle into a station, I think?).

code/modules/admin/fun_balloon.dm

@@ -126,7 +126,7 @@
 /obj/effect/station_crash
 	name = "station crash"
 	desc = "With no survivors!"
-	icon = 'icons/obj/items_and_weapons.dmi'
+	icon = 'icons/obj/balloons.dmi'
 	icon_state = "syndballoon"
 	anchored = TRUE
 	var/min_crash_strength = 3