Key MobBase on its ID and stop reading loadID

Every static_npc_mobbase row has ID = loadID since 3.6 dropped the
server-made rows, so the race rune and rune effects are looked up by ID and
the loaders no longer filter on loadID. No value change (dev: 2375 of 2375
rows have ID = loadID). Mob.loadID and NPC.loadID are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/mobileAI/MobAI.java

@@ -470,7 +470,7 @@ public class MobAI {
 
             //trebuchet spawn handler
 
-            if (mob.despawned && mob.getMobBase().getLoadID() == 13171) {
+            if (mob.despawned && mob.getMobBase().getObjectUUID() == 13171) {
                 checkForRespawn(mob);
                 return;
             }