Removes a couple of duplicate gag map_icons + fixes the gags_recolorable component + most lootpanel gags previews (#91341)

## About The Pull Request

Turns out there were a couple of black mask subtypes that I missed as
well as a prisoner uniform subtype.

Also fixes some bugs that are not related to the map icon pr to further
improve the situation with GAGS previews.

## Why It's Good For The Game

Smaller .dmis, working previews

## Changelog

🆑
fix: spraycan can now be used to recolor the gi, glow shoes, striped
dress, H.E.C.K. suit
fix: most GAGS items should now be showing up in the lootpanel again
/🆑

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

@@ -10,10 +10,13 @@
 /obj/item/screwdriver/caravan
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "screwdriver_caravan"
+	post_init_icon_state = null
 	desc = "A prototype of a new screwdriver design, allegedly the red color scheme makes it go faster."
 	name = "experimental screwdriver"
 	toolspeed = 0.3
 	random_color = FALSE
+	greyscale_config = null
+	greyscale_colors = null
 
 /obj/item/wirecutters/caravan
 	icon = 'icons/obj/tools.dmi'