Ruins now log to world only in TESTING mode (#35421)

* Ruins now log to the game log instead of the runtime log

* Remove it entirely

* Use TESTING

code/modules/mapping/ruins.dm

@@ -16,7 +16,7 @@
 		if(!valid)
 			continue
 
-		log_world("Ruin \"[name]\" placed at ([central_turf.x], [central_turf.y], [central_turf.z])")
+		testing("Ruin \"[name]\" placed at ([central_turf.x], [central_turf.y], [central_turf.z])")
 
 		for(var/i in get_affected_turfs(central_turf, 1))
 			var/turf/T = i