Add a janitorial 'borg plunger (#85475)

## About The Pull Request
I got annoyed at not being able to plung vents when there's a clog. This
PR corrects that. I copied all of the cyborg mop attributes to make
this. This is my first PR on this server, but I did test it on a local
server, and it indeed, plungs.

## Why It's Good For The Game
More content for janitorial cyborg. They really should have a plunger,
to be honest. It just makes sense to me.

## Changelog
🆑
add: Added a cyborg plunger for janitorial modules
/🆑

code/game/objects/structures/lavaland/geyser.dm

@@ -185,3 +185,7 @@
 	layer_mode_sprite = "reinforced_plunger_layer"
 
 	custom_premium_price = PAYCHECK_CREW * 8
+
+/obj/item/plunger/cyborg/Initialize(mapload)
+	. = ..()
+	ADD_TRAIT(src, TRAIT_NODROP, CYBORG_ITEM_TRAIT)