Fixes runtime when dropping an IED (#96621)

## About The Pull Request

arguments are important for functioning procs

## Why It's Good For The Game

<img width="342" height="96" alt="image"
src="https://github.com/user-attachments/assets/af33d6e3-5483-4e6b-8e7a-638f85eb149c"
/>

the hell was this guy doing to drop an ied 42 times in one round

## Changelog
🆑

fix: fixed a runtime when dropping an IED

/🆑

code/game/objects/items/grenades/ghettobomb.dm

@@ -75,10 +75,10 @@
 	if(activator)
 		activator.holder_movement()
 
-/obj/item/grenade/iedcasing/dropped()
+/obj/item/grenade/iedcasing/dropped(mob/user, silent)
 	. = ..()
 	if(activator)
-		activator.dropped()
+		activator.dropped(user, silent)
 
 /obj/item/grenade/iedcasing/proc/process_activation(obj/item/assembly)
 	detonate()