Skip the shopkeeper rune when applying an NPC rune set

applyRunesForNPC already adds 252620, and most rune sets repeat it, so
NPCs with a set listed the shopkeeper rune twice after the runeSet fix.

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

src/engine/gameManager/NPCManager.java

@@ -480,6 +480,11 @@ public enum NPCManager {
         npc.runes.add(shopkeeper);
         if (NPCManager._runeSetMap.containsKey(npc.runeSetID)) {
             for (int runeID : _runeSetMap.get(npc.runeSetID)) {
+
+                // Shopkeeper is already applied above and most rune sets repeat it
+                if (runeID == 252620)
+                    continue;
+
                 RuneBase rb = RuneBase.getRuneBase(runeID);
                 if (rb != null) {
                     CharacterRune toApply = new CharacterRune(rb, npc.getObjectUUID());