Allows robot organs to die (#22739)

Fixes robot organs continuing to process after death.

Stops this:
<img width="790" height="331" alt="image"
src="https://github.com/user-attachments/assets/5f8db817-0a8d-4263-90f4-74a18da78d9a"
/>

code/modules/surgery/organs_internal.dm

@@ -156,6 +156,7 @@
 				user.visible_message("<b>[user]</b> repairs [target]'s [I.name] with [tool].", \
 					SPAN_NOTICE("You repair [target]'s [I.name] with [tool].") )
 				I.surgical_fix(user)
+				START_PROCESSING(SSprocessing, I)
 				if(istype(tool, /obj/item/stack/nanopaste))
 					var/obj/item/stack/nanopaste/nanopaste = tool
 					nanopaste.use(1)