During unit tests, does extra verification on text based overlays (#59553)

This makes it so during unit tests, adding a text based overlay to something will runtime if the icon does not have an icon state matching that text. I would do this during normal compiles as well but getting the icon states from an icon is surprisingly expensive.

Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>

code/modules/projectiles/guns/ballistic/toy.dm

@@ -66,6 +66,7 @@
 	fire_sound = 'sound/items/syringeproj.ogg'
 	slot_flags = ITEM_SLOT_BELT
 	w_class = WEIGHT_CLASS_SMALL
+	gun_flags = NONE
 
 /obj/item/gun/ballistic/automatic/c20r/toy //This is the syndicate variant with syndicate firing pin and riot darts.
 	name = "donksoft SMG"

code/modules/projectiles/guns/energy/energy_gun.dm

@@ -5,7 +5,7 @@
 	w_class = WEIGHT_CLASS_BULKY
 	inhand_icon_state = null //so the human update icon uses the icon_state instead.
 	ammo_type = list(/obj/item/ammo_casing/energy/disabler, /obj/item/ammo_casing/energy/laser)
-	modifystate = 1
+	modifystate = TRUE
 	can_flashlight = TRUE
 	ammo_x_offset = 3
 	flight_x_offset = 15
@@ -69,6 +69,7 @@
 	lefthand_file = 'icons/mob/inhands/weapons/guns_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/weapons/guns_righthand.dmi'
 	ammo_type = list(/obj/item/ammo_casing/energy/net, /obj/item/ammo_casing/energy/trap)
+	modifystate = FALSE
 	w_class = WEIGHT_CLASS_NORMAL
 	can_flashlight = FALSE
 	ammo_x_offset = 1