[no gbp] Loot panel subsystem initializes now (#82680)

## About The Pull Request
Confusing error message at loading screen


![image](https://github.com/tgstation/tgstation/assets/42397676/850e5f97-f319-4f4d-b49a-ff90bb527aa8)
## Why It's Good For The Game
Less confusing
## Changelog
🆑
fix: CentCom dispatched a team of interns to fix the loot panel's
loading message. It should now load properly. It did before too, but now
the message is fixed.
/🆑

---------

Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>

code/modules/lootpanel/ss_looting.dm

@@ -2,8 +2,9 @@
 /// Queues image generation for search objects without icons
 SUBSYSTEM_DEF(looting)
 	name = "Loot Icon Generation"
-	init_order = INIT_ORDER_LOOT
+	flags = SS_NO_INIT
 	priority = FIRE_PRIORITY_PROCESS
+	runlevels = RUNLEVEL_LOBBY|RUNLEVELS_DEFAULT
 	wait = 0.5 SECONDS
 	/// Backlog of items. Gets put into processing
 	var/list/datum/lootpanel/backlog = list()
@@ -32,7 +33,7 @@ SUBSYSTEM_DEF(looting)
 
 		if(!panel.process_images())
 			backlog += panel
-			
+
 		if(MC_TICK_CHECK)
 			return