You can put the surplus energy sword on your belt slot (nmh larp?) (#96619)

## About The Pull Request
When the surplus energy sword is inactive you can put it into your belt
slot.
There is a worn sprite for it now as well to accommodate this, shown in
the video below as well as the active check.

https://github.com/user-attachments/assets/59c2e404-b6d7-4125-a207-582697da351c


## Why It's Good For The Game
It's a expensive and powerful black market item, it's cool to be able to
show it off without having to wave it around in people's faces. Belt
slot is valuable real estate already; i don't see any issues with
letting it hold a tiny item, and you can't leave it active while on your
belt.
## Changelog
🆑
qol: you can put the surplus esword onto your belt
image: updated belt.dmi with worn sprites for the surplus esword
/🆑

---------

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/game/objects/items/weaponry/melee/energy.dm

@@ -125,7 +125,6 @@
 	else
 		heat = initial(heat)
 		STOP_PROCESSING(SSobj, src)
-
 	tool_behaviour = (active ? TOOL_SAW : NONE) //Lets energy weapons cut trees. Also lets them do bonecutting surgery, which is kinda metal!
 	if(user)
 		balloon_alert(user, "[name] [active ? "enabled":"disabled"]")
@@ -410,6 +409,9 @@
 	alt_sharpness = NONE
 	alt_force_mod = -12
 	alt_hitsound = SFX_SWING_HIT
+	worn_icon_state = "energysurplus"
+	slot_flags = ITEM_SLOT_BELT
+	light_color = LIGHT_COLOR_LIGHT_CYAN
 	/// Battery used to determine how many hits we can make before our sword switches off and can't be turned back on without a do_after.
 	var/charge = 20
 	/// Our battery maximum.
@@ -548,6 +550,13 @@
 	COOLDOWN_START(src, jiggle_cooldown, 1 SECONDS)
 	return TRUE
 
+/obj/item/melee/energy/sword/surplus/on_transform(obj/item/source, mob/user, active)
+	. = ..()
+	if(active)
+		slot_flags &= ~ITEM_SLOT_BELT
+	else
+		slot_flags |= ITEM_SLOT_BELT
+
 // Null rod variants
 
 /obj/item/melee/energy/sword/nullrod