[NO GBP] Fixes an edge case with meteor moveloop code (#88229)

## About The Pull Request

This felt like an infinite delete trap so I've tested it and didn't find
anything but there's a couple of qdel loop traces in server logs, I
think this happens if something destroys the meteor?

## Changelog
🆑
fix: Fixed an edge case with meteor moveloop code
/🆑

code/modules/meteors/meteor_types.dm

@@ -45,6 +45,9 @@
 
 /obj/effect/meteor/Destroy()
 	GLOB.meteor_list -= src
+	var/datum/move_loop/moveloop = GLOB.move_manager.processing_on(src, SSmovement)
+	if (!isnull(moveloop))
+		UnregisterSignal(moveloop, COMSIG_MOVELOOP_STOP)
 	return ..()
 
 /obj/effect/meteor/Moved(atom/old_loc, movement_dir, forced, list/old_locs, momentum_change = TRUE)