Enables wirecutters to be recolored before buying (#94425)

## About The Pull Request
Wirecutters already had the GAGS to be recolorable; this just enables
players to actually recolor them before purchasing, just like
screwdrivers. This doesn't affect printing them from any of the lathes.
(Big thanks to MrMelb for walking me through this)
## Why It's Good For The Game
Screwdrivers are recolorable, why not wirecutters too?
## Changelog
🆑
qol: Wirecutters are now recolorable when purchasing from a vendor
/🆑

code/modules/mapfluff/ruins/spaceruin_code/caravanambush.dm

@@ -26,6 +26,8 @@
 	worn_icon_state = "cutters"
 	toolspeed = 0.3
 	random_color = FALSE
+	greyscale_config = null
+	greyscale_colors = null
 
 /obj/item/crowbar/red/caravan
 	icon_state = "crowbar_caravan"